Monday, October 31, 2011

Space / Astronomy: Most Popular Articles: Astronaut Costumes for Adults

Space / Astronomy: Most Popular Articles
These articles are the most popular over the last month. // via fulltextrssfeed.com
Astronaut Costumes for Adults
Oct 31st 2011, 11:23

Want an astronaut costume idea? From Halloween to costume parties to plays or skits, any time you need a costume, check out these space related costumes for adults. Find everything from astronaut costumes to alien costumes ideas.

1. Astronaut Launch/Entry Spacesuit

Astronaut Launch/Entry Spacesuit (Adult)Countdown Creations

You will be ready for liftoff with our Astronaut Launch/Entry Spacesuit for adults. Modeled after the orange spacesuits worn by astronauts when the Space Shuttle launches and returns to Earth, this suit features multiple zipper pockets for carrying gear and is outfitted with official NASA patches, including a special "Commander" patch. Also included is a bonus NASA Meatball cap. One size fits most: 5'10" to 6'2" and 170 to 220 lbs. Makes a great astronaut costume for teachers, Halloween, or for your own backyard space missions with the kids.

2. Apollo Space Suit Replica

Apollo Space Suit ReplicaSpace Toys
This Apollo Space Suit was designed around the early NASA Apollo Space Suits. These suits are built to our exact specifications with high attention paid to detail.

Made from a heavy duty denim twill, this suit was built for wear and tear. It can be worn again and again or placed on display. Truly fantastic for the Collector or Museum.

3. Deluxe Apollo Astronaut Spacesuit

Deluxe Apollo Astronaut SpacesuitCountdown Creations
If you're like me, you've always dreamed of being an astronaut. Here's your chance with this costume based on the spacesuits worn by the lunar astronauts.

4. Deluxe Space Shuttle ACES Spacesuit

Deluxe Space Shuttle ACES SpacesuitCountdown Creations
This costume is sturdy, made from heavy duty Nylon Cordura and double stitched. It's a replica of the Space Shuttle Advanced Crew Escape Suit worn by NASA Astronauts for launch and reentry. Try your hand at being an astronaut.

5. Genuine Airforce Surplus Nomex Flight Suit

Genuine Airforce Surplus Nomex Flight SuitSpace Toys
Dress for real. These Airforce Flight Suits are used surplus but in good condition. Made with Nomex material, they are authentic suits which were used on the airforce at one time.

6. Adult Navy Blue Airforce Flight Suit

Adult Navy Blue Airforce Flight SuitSpace Toys
Dress professionally in this air force style flightsuit that comes with a 2-way front zipper, leg zippers, and adjustable waist and cuffs. It is made from a Poly Cotton 60/40 blend.

7. Apollo 17 Spacesuit Replica

Apollo 17 Spacesuit ReplicaCountdown Creations
This might be a bit steep for an ordinary costume, but you'll definitely wow a crowd. I'm afraid it's a little beyond my means, but if I could, this would be the first costume I bought.

8. Astronaut Adult Costume

Astronaut Adult CostumeBuy Costumes

Includes: Silver jumpsuit with American Flag emblem, boot tops, and helmet. Gloves and American Flag not included.

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Space / Astronomy: What's Hot Now: Pictures of the Star Sirius - An Artist's Impression of Sirius A and B

Space / Astronomy: What's Hot Now
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Pictures of the Star Sirius - An Artist's Impression of Sirius A and B
Oct 31st 2011, 10:21

From , former Guide

Pictures of the Star Sirius - An Artist's Impression of Sirius A and B

Pictures of the Star Sirius - An Artist's Impression of Sirius A and B

NASA, ESA and G. Bacon (STScI)

This picture is an artist's impression showing how the binary star system of Sirius A and its diminutive blue companion, Sirius B, might appear to an interstellar visitor. The large, bluish-white star Sirius A dominates the scene, while Sirius B is the small but very hot and blue white-dwarf star on the right. The two stars revolve around each other every 50 years. White dwarfs are the leftover remnants of stars similar to our Sun. The Sirius system, only 8.6 light-years from Earth, is the fifth closest stellar system known. Sirius B is faint because of its tiny size. Its diameter is only 7,500 miles, slightly smaller than the size of our Earth. The Sirius system is so close to Earth that most of the familiar constellations would have nearly the same appearance as in our own sky. In this rendition, we see in the background the three bright stars that make up the Summer Triangle: Altair, Deneb, and Vega. Altair is the white dot above Sirius A; Deneb is the dot to the upper right; and Vega lies below Sirius B. But there is one unfamiliar addition to the constellations: our own Sun is the second-magnitude star, shown as a small dot just below and to the right of Sirius A.

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Space / Astronomy: What's Hot Now: Pictures of the Star Sirius - The Dog Star, Sirius, and its Tiny Companion

Space / Astronomy: What's Hot Now
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Pictures of the Star Sirius - The Dog Star, Sirius, and its Tiny Companion
Oct 31st 2011, 10:21

This Hubble Space Telescope image shows Sirius A, the brightest star in our nighttime sky, along with its faint, tiny stellar companion, Sirius B. Astronomers overexposed the image of Sirius A [at center] so that the dim Sirius B [tiny dot at lower left] could be seen. The cross-shaped diffraction spikes and concentric rings around Sirius A, and the small ring around Sirius B, are artifacts produced within the telescope's imaging system. The two stars revolve around each other every 50 years. Sirius A, only 8.6 light-years from Earth, is the fifth closest star system known.

Sirius B, a white dwarf, is very faint because of its tiny size, only 7,500 miles in diameter. White dwarfs are the leftover remnants of stars similar to the sun. They have exhausted their nuclear fuel sources and have collapsed down to a very small size. Sirius B is about 10,000 times fainter than Sirius A. The white dwarf's feeble light makes it a challenge to study, because its light is swamped in the glare of its brighter companion as seen from telescopes on Earth. However, using the keen eye of Hubble's Space Telescope Imaging Spectrograph (STIS), astronomers have now been able to isolate the light from Sirius B and disperse it into a spectrum. STIS measured light from Sirius B being stretched to longer, redder wavelengths due to the white dwarf's powerful gravitational pull. Based on those measurements, astronomers have calculated Sirius B's mass at 98 percent that of the sun. Analysis of the white dwarf's spectrum also has allowed astronomers to refine the estimate for its surface temperature to about 44,900 degrees Fahrenheit (25,200 degrees Kelvin).

Accurately determining the masses of white dwarfs is fundamentally important to understanding stellar evolution. The sun will eventually become a white dwarf. White dwarfs are also the source of Type Ia supernova explosions, which are used because of their brightness to measure the distance to distant galaxies and the expansion rate of the universe. Measurements based on Type Ia supernovae are fundamental to understanding "dark energy," a dominant repulsive force stretching the universe apart. Also, the method used to determine the white dwarf's mass relies on one of the key predictions of Einstein's theory of General Relativity: that light loses energy when it attempts to escape the gravity of a compact star. This effect is known as the gravitational redshift of the light.

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Sunday, October 30, 2011

Space / Astronomy: What's Hot Now: Pythagoras of Samos Pictures - Pythagoras Bust

Space / Astronomy: What's Hot Now
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Pythagoras of Samos Pictures - Pythagoras Bust
Oct 30th 2011, 10:24

From , former Guide

Pythagoras of Samos Pictures - Pythagoras Bust

Pythagoras of Samos Pictures - Pythagoras Bust

Public Domain - With gratitude to School Mathematics/Statistics University of St Andrews, Scotland

Ten years after Pythagoras arrived in Egypt, relations between that country and Samos fell apart. Polycrates sent 40 ships to help Cambyses II, the king of Persia, invaded Egypt. During this war, Egypt lost and Pythagoras was taken prisoner and taken to Babylon. Pygathoras wasn't treate as a prisoner of war as we would consider today. He continued his education in mathematics and music and delved into the teachings of the priests, learning their sacred rites. He became extremely proficient in his studies of mathematics and sciences as taught by the Babylonians.

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Space / Astronomy: What's Hot Now: Sir Isaac Newton

Space / Astronomy: What's Hot Now
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Sir Isaac Newton
Oct 30th 2011, 10:24

Sir Isaac Newton finally returned to Cambridge in 1667, where he spent the next 29 years. During this time, he published many of his most famous works, beginning with the treatise, "De Analysi," dealing with infinite series. Newton’s friend and mentor Isaac Barrow was responsible for bringing the work to the attention of the mathematics community. Shortly afterwards, Barrow who held the Lucasian Professorship (established just four years previously, with Barrow the only recipient) at Cambridge gave it up so that Newton could have the Chair.

With his name becoming well known in scientific circles, Sir Isaac Newton came to the attention of the public for his work in astronomy, when he designed and constructed the first reflecting telescope. This breakthrough in telescope technology, which gave a sharper image than was possible with a large lens, ensured his election to membership in the Royal Society.

The scientists, Sir Christopher Wren, Robert Hooke, and Edmond Halley began a disagreement in 1684, over whether it was possible that the elliptical orbits of the planets could be caused by gravitational force towards the sun which varied inversely as the square of the distance. Halley traveled to Cambridge to ask the Lucasian Chair, himself.

Sir Isaac Newton claimed to have solved the problem four years earlier, but could not find the proof among his papers. After Halley’s departure, Isaac worked diligently on the problem and sent an improved version of the proof to the distinguished scientists in London. Throwing himself into the project of developing and expanding his theories, Newton eventually turned this work into his greatest book, “Philosophiae Naturalis Principia Mathematica” in 1686. This work, which Halley encouraged him to write, and which Halley published at his own expense, brought him more into the view of the public and changed our view of the universe forever.

Shortly after this, Sir Isaac Newton moved to London, accepting the position of Master of the Mint. For many years afterward, he argued with Robert Hooke over who had actually discovered the connection between elliptical orbits and the inverse square law, a dispute which ended only with Hooke’s death in 1703.

In 1705, Queen Anne bestowed knighthood upon him, making him Sir Isaac Newton. Another dispute began in 1709, this time with German mathematician, Gottfried Leibniz, over which of them had invented calculus. While it may never have been settled to the satisfaction of either man, it lasted until around 1716.

One reason for Sir Isaac Newton's disputes with other scientists was his tendency to write his brilliant articles, then not publish until after another scientist created similar work. Besides his earlier work, "De Analysi" (which didn't see publication until 1711) and "Principia" (published in 1687), Newton's other works included "Optics" (published in 1704), "The Universal Arithmetic" (published in 1707), the "Lectiones Opticae" (published in 1729), the "Method of Fluxions" (published in 1736), and the "Geometrica Analytica" (printed in 1779).

On March 20, 1727, Sir Isaac Newton died near London. He was buried in Westminster Abbey, the first scientist to be accorded this honor. Today, Stephen Hawking holds the Lucasian Chair.

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Space / Astronomy: What's Hot Now: Robert Goddard Biography

Space / Astronomy: What's Hot Now
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Robert Goddard Biography
Oct 30th 2011, 10:24

On October 5, 1882, Nahum Danford Goddard, a businessman, and Fannie Hoyt Goddard delivered a son, Robert, in Worcester, Massachusetts. Early in life, young Robert suffered from pulmonary tuberculosis which kept him out of school for long periods of time. However, he kept up with his studies and was an avid reader, devouring Cassell's Popular Educator as well as popular science fiction novels. In Fact, it was after reading H.G. Wells's "The War of the Worlds" that he first became interested in space exploration.

He later wrote in his autobiography about an inspiration that came to him as a boy. While his family was staying at the suburban home of friends in Worcester, on October 19, 1899, he climbed into an old cherry tree to prune its dead branches. Instead, he began daydreaming: "It was one of the quiet, colorful afternoons of sheer beauty which we have in October in New England, and as I looked toward the fields at the east, I imagined how wonderful it would be to make some device which had even the possibility of ascending to Mars, and how it would look on a small scale, if sent up from the meadow at my feet."

"I was a different boy when I descended the tree from when I ascended, for existence at last seemed very purposive."

October 19 became "Anniversary Day," noted in his diary as his personal holiday.

Five years later, after graduating from school, Robert Goddard applied and was accepted at Worcester Polytechnic Institute. In 1907, while a student at Worcester Polytechnic Institute in Massachusetts, Goddard experimented on a rocket powered by gunpowder in the basement of the physics building. Clouds of smoke caused a lot of commotion and the faculty, rather than expel him, took an interest in his work.

He received his degree in physics in 1908 and was made a Fellow in the physics department at Clark University. There, he received his master's degree in 1910 and in 1911 he received his doctorate.

By 1914, Goddard already had received two U.S. patents (#1,103,503 and #1,102,653): one for a rocket using liquid fuel and the other for a two- or three-stage rocket using solid fuel. Until that time, propulsion was provided by various types of gunpowder.

That year, he began teaching physics at Clark University in Worcester. His thoughts on space flight started to emerge in 1915, when he theorized that a rocket would work in a vacuum, and didn't need to push against air in order to fly. This meant that in the vacuum of space, rocket engines would be able to produce thrust. At his own expense, he began to make systematic studies about propulsion provided by various types of gunpowder. He began experiments on the efficiency of rockets. He bought some commercial rockets and measured their thrust using a ballistic pendulum, a heavy mass suspended by ropes, to which the rocket was attached. The rocket was fired, and the height to which the pendulum rose provided a measure of the total momentum (mass times velocity) imparted to it. Goddard also used an equivalent set-up, where the mass pushed against a spring, instead of being suspended.

His classic document was a study that he wrote in 1916 requesting funds of the Smithsonian Institution so that he could continue his research. This was later published along with his subsequent research and Navy work in a Smithsonian Miscellaneous Publication No. 2540 (January 1920). It was entitled "A Method of Reaching Extreme Altitudes." In this treatise, he detailed his search for methods of raising weather recording instruments higher than sounding balloons. In this search, as he related, he developed the mathematical theories of rocket propulsion.

Goddard's discoveries were given little attention by the U.S. government. Funding from the Smithsonian Institution allowed Goddard to continue his rocket research and develop the mathematical theories of rocket propulsion. In 1920, the Smithsonian published his original paper, "A Method for Reaching Extreme Altitudes," in which he included a small section stressing that rockets could be used to send payloads to the Moon exploding a load of flash powder there to mark its arrival. The bulk of his scientific report to the Smithsonian was a dry explanation of how he used the $5000 grant in his research. Yet, the press picked up Goddard's scientific proposal about a rocket flight to the moon and erected a journalistic controversy concerning the feasibility of such a thing. Much ridicule came Goddard's way. And he reached firm convictions about the virtues of the press corps which he held for the rest of his life.

He responded to a reporter's question by stating, "Every vision is a joke until the first man accomplishes it; once realized, it becomes commonplace."

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Saturday, October 29, 2011

Space / Astronomy: What's Hot Now: Sirius

Space / Astronomy: What's Hot Now
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Sirius
Oct 29th 2011, 10:20

Other Names:

  • Dog Star
  • Canicula
  • Aschere
  • Alpha Canis Majoris
  • HR 2491
  • HD 48915

Data:

  • Right Ascension: 06 45 08.9
  • Declination: -16 42 58
  • Apparent Magnitude: -1.46
  • Absolute Magnitude: 0.00
  • Distance: 8.6 LY
  • Spectral Type: A1Vm

Constellation:

Sirius Information:

Sirius, also known as the Dog Star, is the brightest star in the sky. It is also the sixth closest star to Earth. at 8.6 light years. Its name comes from the Greek word for scorching. In 1844, F.W. Bessel used analysis of its motion to determine that it had a companion. This companion was confirmed by observations in 1862 and is now known to be a white dwarf. Sirius B, the companion, has received considerable attention itself, since it is the first white dwarf with a spectrum to show a gravitational red shift as predicted by the general theory of relativity. Sirius is located in the constellation Canis Major.

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Space / Astronomy: What's Hot Now: Space Urban Legends

Space / Astronomy: What's Hot Now
These articles that had the largest increase in popularity over the last week // via fulltextrssfeed.com
Space Urban Legends
Oct 29th 2011, 10:20

Considering the fascination that outer space holds for so many of us, it's not surprising that speculation, rumors and bad astronomy abound. Here are your Guide's top 10 Space urban legends and myths and bad astronomy examples. From hoaxes to conspiracies to sex in space, here's an intriguing look at what some people believe. Bad Astronomy, space mistakes, and urban legends.

Don't forget to check out the About Urban Legends site.

1. Mars Close to Earth Email

It is possible you've received an email which says that Mars will be closest to Earth in August in 50,000 years. Is it true? Well, if Mars ever looked as large as the Moon, Earth would be in serious trouble. Learn more about the story.

2. Extraterrestrial Contact Law

Recently, emails have been flying around the Internet which say basically, "If the government has no knowledge of aliens, then why does Title 14, Section 1211 of the Code of Federal Regulations, implemented on July 16, 1969, make it illegal for U.S. citizens to have any contact with extraterrestrials or their vehicles?" Find out the truth about this real law and its purpose. Urban Legends?

3. Is the Great Wall of China Visible From Space?

Even the game, Trivial Pursuit claims that the Great Wall of China is the only man-made object visible by NASA astronauts from space or from the moon with the naked eye. Discover the truth about the myth.

4. Space Pen - A Million Dollar Waste of Tax Dollars?

We all know that the US government likes to spend extravagantly. Did NASA actually spend millions of dollars developing an "astronaut pen" that would work in outer space while the Soviets solved the same problem by simply using pencils. Was this just the tip of the problem or more urban legends or myths?

5. Space Shuttles and Horses' A**es

According to a humorous email circulating, the width of the Space Shuttle was determined by the width of the transportation medium needed to move it to the cape for launching. Was the NASA transportation medium designed from the original specification for an Imperial Roman war chariot? Was NASA led by the nose or were we led into believing urban legends and myths?

6. The Sun Will Explode in 6 Years

This may be the ultimate in bad astronomy. Are scientists predicting that the sun will explode in less than six years or is this bad astronomy? According to an email making the rounds it will. It just goes to show that you shouldn’t believe everything you read and you should always check the sources of information. Does NASA know something we don't or is this another case of bad astronomy?

7. Ancient Monuments and Human Face on Mars

People have argued about the "Face on Mars" since the Viking orbiter photographed it in 1976. Was it left by aliens as a signal to a future space-faring race, us? Is NASA covering up, or is this another of the urban legends?

8. Did Neil Armstrong Send a Message To a Former Neighbor?

According to the email, when Apollo Mission Astronaut Neil Armstrong first walked on the moon, he not only gave his famous "one small step for man, one giant leap for mankind" statement but followed it by several remarks, including the enigmatic remark "Good luck, Mr. Gorsky." Did he say it, and what did it mean? Does NASA know the truth behind the myths?

9. Did NASA Fake the Moon Landing?

Many years after the crew of Apollo 11 landed on the moon, followed by several other successful missions and one successful failure, there are still people who believe that NASA faked the whole thing. Was the movie, "Capricorn One" too close to the truth? Is NASA covering up something? Conspiracies or urban legends?

10. Sex In The Space Shuttle

There’s another email making the rounds that claims NASA was involved in some interesting experimentation on recent space shuttle missions. So, what would sex in space involve? Find out more, including about "The necessary thrusting motion."

Discuss Urban Legends, Myths & Bad Astronomy

Join our discussion of Urban Legends, Myths & Bad Astronomy in our forum. Share your opinions and tell us of any other Urban Legends, Myths & Bad Astronomy you know of.

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Friday, October 28, 2011

Space / Astronomy: What's Hot Now: The Evolution of the SpaceSuit

Space / Astronomy: What's Hot Now
These articles that had the largest increase in popularity over the last week // via fulltextrssfeed.com
The Evolution of the SpaceSuit
Oct 28th 2011, 10:19

Ever since Alan Shepard's history making flight in 1961, NASA astronauts have relied on spacesuits to help them work and keep them safe. From the shiny silver of the Mercury suit to the orange "pumpkin suits" of shuttle crew, the suits have served as personal spacecraft, protecting explorers during launch and entry, while working on the International Space Station, or walking on the moon.

Just as NASA has a new spacecraft, Orion, new suits will be needed to protect future astronauts as they return to the moon and eventually Mars.

1. Project Mercury

This is Gordon Cooper, one of NASA's original seven astronauts chosen in 1959, posing in his Mercury Flight Suit.

When NASA's Mercury program began, the spacesuits kept the designs of earlier pressurized flight suits used in high altitude aircraft. However, NASA added a material called Mylar which gave the suit strength, and the ability to withstand extreme temperatures.

2. Project Mercury

Astronaut John H. Glenn Jr. in his silver Mercury spacesuit during pre- flight training activities at Cape Canaveral. On February 20, 1962 Glenn lifted off into space aboard his Mercury Atlas (MA-6) rocket and became the first American to orbit the Earth. After orbiting the Earth 3 times, Friendship 7 landed in the Atlantic Ocean 4 hours, 55 minutes and 23 seconds later, just East of Grand Turk Island in the Bahamas. Glenn and his capsule were recovered by the Navy Destroyer Noa, 21 minutes after splashdown.

Glenn is the only astronaut to fly in space wearing both a Mercury and a shuttle suit.

3. Project Gemini Space Suit

Project Gemini Space SuitNASA

Future moonwalker Neil Armstrong in his Gemini G-2C training suit. When Project Gemini came along, Astronauts found it difficult to move in the Mercury spacesuit when it was pressurized; the suit itself was not designed for space walking so some changes had to be made. Unlike the "soft" Mercury suit, the whole Gemini suit was made to be flexible when pressurized.

4. Project Gemini Space Suit

Gemini astronauts learned that cooling their suit with air did not work very well. Often, the astronauts were overheated and exhausted from space walks and their helmets would fog up on the inside from excessive moisture. Prime crew for the Gemini 3 mission are photographed in full length portraits in their space suits. Viril I. Grissom (left) and John Young are seen with the portable suit air conditioners connected and their helmets on; Four Gemini astronauts are photographed in full pressure suits. From left to right are John Young and Virgil I. Grissom, the prime crew for Gemini 3; as well as Walter M. Schirra and Thomas P. Stafford, their backup crew.

5. First American Spacewalk

Astronaut Edward H. White II, pilot for the Gemini-Titan 4 space flight, floats in zero gravity of space. The extravehicular activity was performed during the third revolution of the Gemini 4 spacecraft. White is attached to the spacecraft by a 25-ft. umbilical line and a 23-ft. tether line, both wrapped in gold tape to form one cord. In his right hand White carries a Hand-Held Self-Maneuvering Unit (HHSMU). The visor of his helmet is gold plated to protect him from the unfiltered rays of the sun.

6. Project Apollo

With the Apollo program, NASA knew that Astronauts would have to walk on the moon. So space suit designers came up with some creative solutions based on information they collected from the Gemini program.

Engineer Bill Peterson fits test pilot Bob Smyth in space suit A-3H-024 with the Lunar Excursion Module astronaut restraint harness during suit evaluation study.

7. Project Apollo

Spacesuits used by the Apollo astronauts were no longer air-cooled. A nylon undergarment mesh allowed the astronaut's body to be cooled with water - similar to way a radiator cools a car's engine.

Additional layers of fabric allowed for better pressurization and additional heat protection.

Astronaut Alan B. Shepard Jr. undergoes suiting up operations at the Kennedy Space Center during the Apollo 14 prelaunch countdown. Shepard is the commander of the Apollo 14 lunar landing mission.

8. Moon Walk

A single spacesuit was developed that had add-ons for moon walking.

For walking on the moon, the spacesuit was supplemented with additional gear - like gloves with rubber fingertips, and a portable life support backpack that contained oxygen, carbon-dioxide removal equipment and cooling water. The spacesuit and backpack weighed 82 kg on Earth, but only 14 kg on the moon due to its lower gravity.

This photo is of Edwin "Buzz" Aldrin walking on the lunar surface.

9. Space Shuttle Suit

Space Shuttle SuitNASA

When the first shuttle flight, STS-1, lifted off on April 12, 1981, astronauts John Young and Robert Crippen wore the ejection escape suit modeled here. It's a modified version of a US Air Force high-altitude pressure suit.

10. Space Shuttle Suit

Space Shuttle Suit

The familiar orange launch and entry suit worn by shuttle crews, nicknamed the "pumpkin suit" for its color. The suit includes the launch and entry helmet with communications gear, parachute pack and harness, life raft, life preserver unit, gloves, oxygen manifold and valves, boots and survival gear.

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Space / Astronomy: What's Hot Now: Earth Pictures - Earth - India and Australia

Space / Astronomy: What's Hot Now
These articles that had the largest increase in popularity over the last week // via fulltextrssfeed.com
Earth Pictures - Earth - India and Australia
Oct 28th 2011, 10:19

This color image of the Earth was obtained by the Galileo spacecraft on Dec. 11, 1990, when the spacecraft was about 1.5 million miles from the Earth. The color composite used images taken through the red, green and violet filters. India is near the top of the picture, and Australia is to the right of center. The white, sunlit continent of Antarctica is below. Picturesque weather fronts are visible in the South Pacific, lower right. This is a frame of the Galileo Earth spin movie, a 500-frame time-lapse motion picture showing a 25-hour period of Earth's rotation and atmospheric dynamics.

Discover Earth's companion. Check out these images in our Moon Pictures Gallery.

Our Geology Guide also has some great links to Earth Images from Space. Check them out.

Discover the rest of the galactic neighborhood with our Solar System Tour.

Learn your way around the night sky with a Sky Map. They're free.

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Space / Astronomy: What's Hot Now: Shuttle Challenger Disaster

Space / Astronomy: What's Hot Now
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Shuttle Challenger Disaster
Oct 28th 2011, 10:19

The reaction was immediate, from the crowds of family and friends gathered to watch the launch of the Space Shuttle Challenger, to the millions tuned in worldwide, most people were stunned. In a speech later that day, President Ronald Reagan expressed the feelings of many who were grieving.

"Today is a day for mourning and remembering," he said. "Nancy and I are pained to the core over the tragedy of the shuttle Challenger. We know we share this pain with all of the people of our country. This is truly a national loss. Nineteen years ago, almost to the day, we lost three astronauts in a terrible accident on the ground. But we've never lost an astronaut in flight. We've never had a tragedy like this. And, perhaps, we've forgotten the courage it took for the crew of the shuttle. But the Challenger Seven were aware of the dangers and overcame them and did their job brilliantly. We mourn seven heroes."

Afterwards, a special commission to investigate the cause of the Space Shuttle Challenger accident was appointed by President Reagan. Headed by former secretary of state William Rogers the commission included former astronaut Neil Armstrong and former test pilot Chuck Yeager.

The commission's report cited the cause of the disaster as a the failure of an “O-ring” seal in the solid-fuel rocket on the Space Shuttle Challenger's right side. The faulty design of the seal coupled with the unusually cold weather, let hot gases to leak through the joint. Booster rocket flames were able to pass through the failed seal enlarging the small hole. These flames then burned through the Space Shuttle Challenger's external fuel tank and through one of the supports that attached the booster to the side of the tank. That booster broke loose and collided with the tank, piercing the tank's side. Liquid hydrogen and liquid oxygen fuels from the tank and booster mixed and ignited, causing the Space Shuttle Challenger to tear apart.

The commission not only found fault with a failed sealant ring but also with the officials at the National Aeronautics and Space Administration (NASA) who allowed the shuttle launch to take place despite concerns voiced by NASA engineers.

The entire space shuttle program was grounded during the Space Shuttle Challenger Commission's investigation and did not resume flying until shuttle designers made several technical modifications and NASA management implemented stricter regulations regarding quality control and safety. Shuttle missions resumed on September 28, 1988, with the flight of the shuttle Discovery.

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Thursday, October 27, 2011

Space / Astronomy: What's Hot Now: Sun Info

Space / Astronomy: What's Hot Now
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Sun Info
Oct 27th 2011, 10:19

The Sun is the central body in our solar system. It simultaneously provides the energy critically needed for life to persist on Earth, as well as gravitationally bind the planets in their orbits. This main sequence star comprises nearly 99.86% of the total mass in the solar system.

Upon the surface of the Sun there are many distinguishing features, many of which were originally discovered by Galileo. Among these are sun spots, solar prominences and solar flares. The frequency at which these phenomena appear are an indication of where the Sun is in its solar cycle. Solar flares have also been the subject of many theories of how the Earth may finally meet its end.

The Sun - By the Numbers

  • Mass (kg): 1.989 × 1030
  • Volume (km3: 1.412 × 1018
  • Mean equatorial radius (km): 6.96 × 105
  • Mean density (kg/m3): 1.408 × 103
  • Core temperature (K): 15.7 × 106
  • Mean surface temperature (K): 5,778
  • Mean surface gravity (m/s2): 274.0 (~28 times Earth's gravity)
  • Mean distance from Earth (km): 1.496 × 108
  • Mean distance from Galactic center (km): 2.5 × 1017
  • Visual magnitude: 26.74
  • Absolute magnitude: +4.83
  • Luminosity (1024 J/s): 384.6
  • Spectral type: G2V

Layers (structure) of the Sun

The Core: The central part of the Sun, called the core, extends from the center of the star out to about 25% of its radius (~1.6% of its total volume). Inside the core the temperature and pressure are sufficient to cause hydrogen to fuse into helium through the proton-proton chain (p-p chain). This process supplies nearly all of the energy output of the Sun, as it is carried to the surface through light released during the conversion of mass during nucleation. The energy output of the core is roughly equivalent to 100 billion nuclear bombs going off every second.

The Radiative Zone:Outside of the core, stretching to a distance of about 70% of the Sun's radius, the hot plasma state of the material is enough to thermally radiate the energy from the core. During this process the temperature drops from 7,000,000 K to about 2,000,000 K.

The Convection Zone:Once the hot gas has cooled enough, just outside the radiative zone, the heat transfer mechanism changes in favor of convection. Essentially the gas lacks the density and temperature necessary to continue radiation and columns form to carry the heat energy to the surface of the Sun. The gas then cools as the energy is transfered to the surface (and ultimately to the atmosphere and beyond). The cool gas then sinks back to the boundary of the radiative and convection zones and the process begins again.

The Photosphere (visible surface):Normally when viewing the Sun (using only proper equipment of course) we see only the photosphere, the visible surface. (Under eclipse conditions, or using special filters, you can also see the corona (atmosphere) as well.) Once photons are brought to the surface of the Sun by the convection zone they are released into space and proceed into the solar system. The surface of the Sun has a temperature of roughly 6,000 kelvin, which according to Wein's law is why the Sun appears yellow on Earth. While still very hot it pales in comparison to the 15.7 million kelvin nuclear furnace of the core, and is actually about the same temperature as the Earth's core.

The Corona (atmosphere):During a solar eclipse a glowing aura can be seen around the Sun. This is the sun's atmosphere, known as the corona. The dynamics of the hot gas that surround the Sun remain somewhat a mystery, as temperatures can reach into the millions of degrees, far hotter than the solar surface. Future experiments hope to discover the mechanism for these high temperatures. The corona is the name given to the collective layers of the atmosphere, but it is also specifically the outermost layer. The lower cool layer (about 4,100 K) receives its photons directly from the photosphere, on which are stacked the progressively hotter layers of the chromosphere and corona until the dark void of space is reached.

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Wednesday, October 26, 2011

Space / Astronomy: What's in a Name? Compete to Rename the VLA.

Space / Astronomy
Get the latest headlines from the Space / Astronomy GuideSite. // via fulltextrssfeed.com
What's in a Name? Compete to Rename the VLA.
Oct 26th 2011, 21:40

In one of my favorite science fiction movies of all time, Contact, astrophysicist Ellie Arroway stumbles across a message from space using the Very Large Array (VLA), a radio telescope array in New Mexico. While the film does not focus on this research facility, it certainly emerges as an interesting character of sorts.

Recently, this amazing facility has been receiving its first significant upgrade since the 1970s. The old, antiquated electronics are being replaced with the latest technologies, greatly improving the array's capabilities.

To reflect this new ability the National Radio Astronomy Observatory (NRAO) is holding a competition to find a new name for the VLA. You can visit the competition site between now and December 1, 2011 and suggest your best idea. The winning entry will be announced at the Astronomical Society meeting in Austin, Texas, on January 10, 2012.

So what's your best suggestion? After submitting your entry, post it down in the comments for everyone to see!

Image Credit: NRAO/AUI, Dave Finley

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Space / Astronomy: Most Popular Articles: Constellation in a Canister

Space / Astronomy: Most Popular Articles
These articles are the most popular over the last month. // via fulltextrssfeed.com
Constellation in a Canister
Oct 26th 2011, 11:19

People have looked at the stars for many, many years. They could imagine pictures in stars. Those pictures are called constellations. After you do this activity, see if you can find the constellations in the night sky.

What you need:

  • 16 black 35mm film canisters
  • Scissors
  • Tape
  • Pushpin
  • Patterns + View patterns

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Space / Astronomy: What's Hot Now: Tsunami Damage in Indonesia - Pictures of Tsunami Damage in Indonesia - Earthquake Spawns Tsunami

Space / Astronomy: What's Hot Now
These articles that had the largest increase in popularity over the last week // via fulltextrssfeed.com
Tsunami Damage in Indonesia - Pictures of Tsunami Damage in Indonesia - Earthquake Spawns Tsunami
Oct 26th 2011, 10:21

Tsunami Damage in Indonesia
Earthquake Spawns Tsunami

** NEW IMAGES FROM MELUABOH **

On December 26, 2004, a tsunami swept across the Indian ocean, spawned by a magnitude 9.0 earthquake off the coast of Sumatra. Indonesia suffered many tsunami casualties, part of the total death toll of over 155,000.

Here we see before and after images of many of the areas of Indonesia hardest hit by the tsunami. Click each image for a larger view.

Meluaboh Overview (Before Tsunami)
Imagery collected May 18, 2004
Description: Area overview before tsunami
Credit: DigitalGlobe
* NEW
Meluaboh Overview
Imagery collected January 7, 2005
Description: Area overview
Credit: DigitalGlobe
* NEW
Banda Aceh Shore (Before Tsunami)
Imagery collected June 23, 2004
Description: Shore detail before tsunami
Credit: DigitalGlobe
Banda Aceh Shore
Imagery collected December 28, 2004
Description: Shore detail
Credit: DigitalGlobe
Banda Aceh City Overview (Before Tsunami)
Imagery collected June 23, 2004
Description: Area overview before tsunami
Credit: DigitalGlobe
Banda Aceh City Overview
Imagery collected December 28, 2004
Description: Area overview
Credit: DigitalGlobe
Banda Aceh Detail Before Debris
Imagery collected June 23, 2004
Description: Area detail before debris
Credit: DigitalGlobe
Banda Aceh Debris Detail
Imagery collected December 28, 2004
Description: Area debris detail
Credit: DigitalGlobe
Banda Aceh Before Flooding
Imagery collected June 23, 2004
Description: Area before flooding
Credit: DigitalGlobe
Banda Aceh Flooding
Imagery collected December 28, 2004
Description: Area detailing flooding from tsunami
Credit: DigitalGlobe
Banda Aceh Northern Shore (Before Tsunami)
Imagery collected June 23, 2004
Description: Shore detail before tsunami
Credit: DigitalGlobe
Banda Aceh Northern Shore
Imagery collected December 28, 2004
Description: Shore detail
Credit: DigitalGlobe
Banda Aceh South Overview (Before Tsunami)
Imagery collected April 12, 2004
Description: South area overview before tsunami
Credit: DigitalGlobe
Banda Aceh South Overview
Imagery collected January 2, 2005
Description: South area overview
Credit: DigitalGlobe
Gleebruk Village (Before Tsunami)
Imagery collected April 12, 2004
Description: Village detail before tsunami
Credit: DigitalGlobe
Gleebruk Village
Imagery collected January 2, 2005
Description: Village detail
Credit: DigitalGlobe

Image Credits: DigitalGlobe - Used by Permission

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