Thursday, November 3, 2011

Space / Astronomy: What's Hot Now: Project Mercury Overview

Space / Astronomy: What's Hot Now
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Project Mercury Overview
Nov 3rd 2011, 10:19

The goals of the Mercury program were fairly simple, even if their accomplishment was not. They were:
  1. To orbit a manned spacecraft around Earth
  2. To investigate man's ability to function in space
  3. To recover both man and spacecraft safely
No one is exactly sure when mankind first dreamed of space travel. Perhaps it was with Johannes Kepler's book "Somnium." Perhaps it was earlier. However, it wasn't until the middle of the 20th cerntury that technology had developed to the point where man could actually transform his ideas into hardware to achieve space flight. Initiated in 1958, completed in 1963, Project Mercury was the United States' first man-in-space program. After setting the above goals for the project, guidelines were put into place that would help insure that the most expedient and safest approach for attainment of the objectives was followed. They were:
  1. Existing technology and off-the-shelf equipment should be used wherever practical.
  2. The simplest and most reliable approach to system design would be followed.
  3. An existing launch vehicle would be employed to place the spacecraft into orbit.
  4. A progressive and logical test program would be conducted.
This led to more detailed requirements for the spacecraft:
  1. The spacecraft must be fitted with a reliable launch-escape system to separate the spacecraft and its crew from the launch vehicle in case of impending failure.
  2. The pilot must be given the capability of manually controlling spacecraft attitude.
  3. The spacecraft must carry a retrorocket system capable of reliably providing the necessary impulse to bring the spacecraft out of orbit.
  4. A zero-lift body utilizing drag braking would be used for reentry.
  5. The spacecraft design must satisfy the requirements for a water landing.
In keeping with the mandate, most of the equipment used was derived from off-the-shelf equipment or through the direct application of existing technology with two exceptions:
  • An automatic blood-pressure measuring system for use in flight.
  • Instruments for sensing the partial pressures of oxygen and carbon dioxide in the oxygen atmosphere of the cabin and suit, respectively.
The decision was made that the military services could provide the pilots for this new endeavor, so from a total of 508 service records screened in January 1959 by Stanley C. White, Robert B. Voas, and William S. Augerson at the military personnel bureaus in Washington, 110 men were found to meet the minimum standards. This list of names included five Marines, 47 Navy men, and 58 Air Force pilots. Although several Army pilots had been screened, none were graduates of a test pilot school. This group of 110 was divided into three groups, but by the completion of round two there were enough volunteers that group three was never called. Through testing, these 69 men were further pared down to 32 and then to 18. Then, by the middle of April the names of America's firt 7 astronauts were known.

Biographies of Original Mercury 7 Astronauts

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Space / Astronomy: What's Hot Now: Space Firsts - Basics

Space / Astronomy: What's Hot Now
These articles that had the largest increase in popularity over the last week // via fulltextrssfeed.com
Space Firsts - Basics
Nov 3rd 2011, 10:19

The first Earthling in space:

Laika, a dog, was launched into space on the Sputnik 2 in 1957. She survived the launch and for a time in space, but after a week, the air ran out and Laika died. The following year, as its orbit deteriorated, the craft exited space and re-entered the Earth's atmosphere and, without heat shields, burned up along with Laika's body.

The first human in space:

Yuri Gagarin, a cosmonaut from the USSR, launched into space on April 12, 1961 aboard the Vostok 1. His flight lasted one hour and forty-five minutes, orbiting the Earth one time. Describing the view of the Earth from space, Gagarin radioed, "It has a very beautiful sort of halo, a rainbow."

The first American in space:

Alan Sheppard was launched into space aboard Mercury 3 on May 5, 1961 to become the first American in space. His craft did not achieve orbit, but rose to a height of 116 miles and traveled 303 miles before safely parachuting into the Atlantic Ocean.

The first American to orbit the Earth:

On February 20, 1962, the Friendship 7 capsule carried astronaut John Glenn around the Earth 3 times on a 5 hour space flight. He was the first American to orbit the earth.

The first woman in space:

Valentina Tereshkova flew in space aboard the Vostok 6 on June 16, 1963.

The first American woman in space:

On June 18, 1983, the space shuttle Challenger lifted off with Sally Ride aboard. She was the first American woman in space.

The youngest American in space:

Besides being the first American woman in space, Sally Ride was also the youngest American when she rode the Challenger in 1983.

The first person to make a second trip into space:

Gemini 3, the first piloted Gemini flight, included Virgil "Gus" Grissom among its crew as it lifted off in March of 1965. He had previously flown in space in July, 1961 aboard the second suborbital Mercury mission.

The first African American in space:

August 30, 1983, the space shuttle Challenger lifted off with Guion "Guy" Bluford, Jr., the first African American in space.

The first African American woman in space:

Mae Jemison lifted off in the space shuttle Endeavour on September 12, 1992, first African American woman in space.

The first space walk:

Alexei Leonov, a Soviet cosmonaut, was the first person to step outside of his spacecraft while in Outer Space, on March 18, 1965. He spent 12 minutes as he floated as far as 17.5 feet from his Voskhod 2 craft, enjoying the first space walk ever.

The first American to walk in space:

During the Gemini 4 mission, Ed White made a 21 minute EVA (Extra-Vehicular Activity), also known as a space walk.

The first American woman to pilot a spacecraft:

Eileen Collins piloted the space shuttle Discovery in 1995.

The first man on the moon:

With his famous words, "That's one small step for man, one giant leap for mankind." Neil Armstrong, on the Apollo 11 mission, stepped onto the Lunar surface on July 20, 1969, becoming the first man on the Moon.

The second human to step on the moon:

Armstrong's Apollo 11 crewmate, Buzz Aldrin, was the second person to step on the moon, also on July 20, 1969.

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For more in-depth information about space, check out our Astronomy 101, free online basic astronomy course. You can earn a certificate.

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Space / Astronomy: What's Hot Now: Constellations Pictures - Capricornus - Picture of the Constellation Capricornus

Space / Astronomy: What's Hot Now
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Constellations Pictures - Capricornus - Picture of the Constellation Capricornus
Nov 3rd 2011, 10:19

From , former Guide

The Goat-Fish - Genitive: Capricorni Abbreviations: Cap, Capr Right Ascension, (h): 21 Declination, (deg): 20S

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Wednesday, November 2, 2011

Space / Astronomy: What's Hot Now: Mars Information

Space / Astronomy: What's Hot Now
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Mars Information
Nov 2nd 2011, 10:50

Basic Information:

  • MEAN RADIUS: 3388.0 km
  • MASS: 0.108 (Earth=1)
  • DENSITY: 3.94 (g/cm^3)
  • GRAVITY: 0.380 (Earth=1)
  • ORBIT PERIOD: 686.98 (Earth days)
  • ROTATION PERIOD: 1.026 (Earth days)
  • SEMIMAJOR AXIS OF ORBIT: 1.524 au
  • ECCENTRICITY OF ORBIT: 0.093

Mars:

Named for the Roman god of War, Mars probably got this name due to its red color. It is sometimes referred to as the Red Planet. The name of the month March derives from Mars. Known since prehistoric times, Mars is still a favorite of choice for human exploration.

The density of Mars is about 30 percent less than that of Earth (3.94 g/cm3 vs. 5.52 g/cm3). Its core is probably similar to Earth's, mostly iron, with small amounts of nickel, but spacecraft mapping of its gravity field seem to indicate that its iron-rich core and mantle are a smaller portion of its volume than on Earth. Also, its smaller magnetic field than Earth, indicates a solid, rather than liquid core.

Mars' atmosphere is 95 percent carbon dioxide, nearly 3 percent nitrogen, and nearly 2 percent argon with trace quantities of oxygen, carbon monoxide, water vapor, ozone, and other trace gases.

The average temperature on Mars is about -55 C or -67 F. It can range from -133 C or -207 F at the winter pole to almost 27 C or 80 F on the day side during summer. Orbiting 227,940,000 km (1.52 AU) from Sun, the Martian year is nearly two Earth years, while its day is only about half an hour longer than Earth's.

Mars has two tiny satellites which orbit very close to the surface: Phobos

  • Distance: 9000 km
  • Radius: 11 km
  • Mass: 1.08e16 kg
  • Discoverer: Hall
  • Date: 1877
Deimos
  • Distance: 23000 km
  • Radius: 6 km
  • Mass: 1.08e15 kg
  • Discoverer: Hall
  • Date: 1877

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Space / Astronomy: What's Hot Now: Neil deGrasse Tyson Biography

Space / Astronomy: What's Hot Now
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Neil deGrasse Tyson Biography
Nov 2nd 2011, 10:50

Dr. Neil deGrasse Tyson is the Frederick P. Rose Director of the Hayden Planetarium at the American Museum of Natural History and Visiting Research Scientist and Lecturer at Princeton University.

Born and raised in New York City, he realized he wanted to study space science when he was young, looking through a pair of binoculars at the moon. Visiting the Old Hayden Planetarium at the age of nine, he was first introduced to the stars. However, in Neil's neighborhood, "being smart is not on the list of things that gets you respect," he recalls. African-American boys were expected to be athletes, not scholars.

At thirteen, he attended summer astronomy camp in the Mohave Desert. There, he could see millions of stars in the clear desert sky. Neil deGrasse Tyson was educated in the public school system and attended the Bronx High School of Science. After graduation, he went on to earn his BA in Physics from Harvard, where he also rowed on the crew team and joined the wrestling team. After earning a Master's degree from the University of Texas at Austin, he went home to New York to do his doctoral work at Columbia and earn his PhD in Astrophysics from Columbia University.

After earning his doctorate, Dr. Neil deGrasse Tyson has worked as an astrophysicist and research scientist at Princeton University, as a columnist for Stardate magazine, and, from 1996, as the first occupant of the Frederick P. Rose Directorship of the Hayden Planetarium in New York City (the youngest director in the long history of the planetarium). His association with Princeton continues, where he is a Visiting Research Scientist in astrophysics and also teaches.

Dr. Tyson published the first of six books on astronomy and astrophysics in 1988. His research interests include star formation, exploding stars, dwarf galaxies, and the structure of our Milky Way. To conduct his research, he uses telescopes all over the world as well as the Hubble Space Telescope.

He has also continued to write prolifically for the public, including a series of essays in Natural History magazine as well as the books "One Universe: At Home in the Cosmos" (coauthored with Charles Liu and Robert Irion) and a Q&A book on the universe for all ages titled "Just Visiting This Planet." "One Universe: At Home in the Cosmos" was the winner of the 2001 American Institute of Physics Science Writing Award to a Scientist. His most recent book was a memoir, "The Sky is Not the Limit: Adventures of an Urban Astrophysicist."

Dr. Neil deGrasse Tyson is married with two children. The Tyson family resides in New York City. Dr. Tyson's interests include collecting fine wines, wrestling, and studying the stars.

In 2001, He was appointed by President Bush to serve on a 12-member commission that studied the Future of the US Aerospace Industry. In 2004, Dr. Tyson was once again appointed by President Bush to serve on a 9-member commission on the Implementation of the United States Space Exploration Policy, dubbed the "Moon, Mars, and Beyond" commission. Recommendations from this group formed the foundation for President Bush's new space vision.

Dr. Tyson’s contributions to the public appreciation of the cosmos were recently recognized by the International Astronomical Union in their official naming of asteroid "13123 Tyson." He was also voted "Sexiest Astrophysicist Alive" in the November 14, 2000 People Magazine, which is their annual "Sexiest Man Alive" issue.

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Space / Astronomy: What's Hot Now: Constellation in a Canister

Space / Astronomy: What's Hot Now
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Constellation in a Canister
Nov 2nd 2011, 10:50

8. Repeat steps 2-8 for the rest of the constellation patterns.

9. Choose one of the canisters and read the name. Look through it to try to remember the pattern. Slowly turn the canister and observe.

10. Try to learn the constellations without looking at the names.

11. Look outside to find the patterns in the sky at night.

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Tuesday, November 1, 2011

Space / Astronomy: What's Hot Now: Pluto Picture - Hubble Portrait of the "Double Planet" Pluto & Charon

Space / Astronomy: What's Hot Now
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Pluto Picture - Hubble Portrait of the "Double Planet" Pluto & Charon
Nov 1st 2011, 10:20

This is the clearest view yet of the distant dwarf planet Pluto and its moon, Charon, as revealed by NASA's Hubble Space Telescope (HST). The image was taken by the European Space Agency's Faint Object Camera on February 21, 1994 when the dwarf planet was 2.6 billion miles (4.4 billion kilometers) from Earth; or nearly 30 times the separation between Earth and the sun.

Hubble's corrected optics show the two objects as clearly separate and sharp disks. This now allows astronomers to measure directly (to within about 1 percent) Pluto's diameter of 1440 miles (2320 kilometers) and Charon's diameter of 790 miles (1270 kilometers).

The Hubble observations show that Charon is bluer than Pluto. This means that both worlds have different surface composition and structure. A bright highlight on Pluto suggests it has a smoothly reflecting surface layer.

A detailed analysis of the Hubble image also suggests there is a bright area parallel to the equator on Pluto. This result is consistent with surface brightness models based on previous ground-based photometric observations. However, subsequent HST observations will be required to confirm whether the feature is real.

Though Pluto was discovered in 1930, Charon wasn't detected until 1978. That is because the moon is so close to Pluto that the two worlds are typically blurred together when viewed through ground-based telescopes. (If our moon were as close to Earth, it would be as big in the night sky as an apple held at arm's length). The new HST image was taken when Charon was near its maximum elongation from Pluto of .9 arc seconds. The two worlds are 12,200 miles apart (19,640 kilometers).

Hubble's ability to distinguish Pluto's disk at a distance of 2.6 billion miles (4.4 billion kilometers) is equivalent to seeing a baseball at a distance of 40 miles (64 kilometers).

Pluto typically is called the double dwarf planet because Charon is half the diameter of Pluto (our Moon is one-quarter the diameter of Earth).

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