Reference Pages
17 September 2012, 04:14 PM ET
Earth is the fifth largest planet in the solar system and the densest.
17 September 2012, 12:12 PM ET
The answer is one 1 astronomical unit. How far is that?
14 September 2012, 03:47 PM ET
The Apollo 9 crew had to contend with human illness as they flew the lunar module in space for the first time.
13 September 2012, 06:10 PM ET
Searching for a "theory of everything," physicists are considering tiny bits of vibrating string.
13 September 2012, 04:52 PM ET
The lunar module Snoopy got within 50,000 feet of the moon's surface.
12 September 2012, 01:43 PM ET
The launch of the world's first satellite was the birth of the Space Age.
10 September 2012, 02:17 PM ET
The first crewed launch of the program proved that the Apollo spacecraft could get astronauts to the moon.
07 September 2012, 05:51 PM ET
One of the astronauts on Apollo 16 left his family on the moon.
06 September 2012, 02:11 PM ET
Astronauts on the moon take the lunar rover for a spin.
05 September 2012, 05:24 PM ET
Alan Shepard's return to space was marked by a tough climb and a tee shot.
04 September 2012, 03:59 PM ET
Caroline Herschel was the first woman to discover a comet. She made several contributions to the field of astronomy
04 September 2012, 01:51 PM ET
Astronomer William Herschel discovered the planet Uranus and 2,500 celestial objects.
31 August 2012, 10:47 AM ET
The Apollo 12 crew needed to land close to their target area to fulfill their mission.
29 August 2012, 01:31 PM ET
The Apollo 8 mission took astronauts around the moon for the first time.
28 August 2012, 03:46 PM ET
The three astronauts on board — Gus Grissom, Ed White, and Roger Chaffee — died. The tragedy changed the way NASA operates.
27 August 2012, 03:29 PM ET
A look at the 18 men who flew on manned moon landing missions.
24 August 2012, 04:15 PM ET
The final Apollo mission took the first scientist to the moon.
23 August 2012, 06:58 PM ET
The first American to orbit Earth made history twice.
23 August 2012, 06:13 PM ET
These powerful objects offer a glimpse into the origins of the universe.
23 August 2012, 12:38 PM ET
The Apollo 13 mission's "problem" tested NASA's ingenuity
21 August 2012, 06:39 PM ET
Sunita Williams, a record-setting astronaut, has a unique way of staying fit in space.
21 August 2012, 05:07 PM ET
Facts and information about the home of NASA's astronaut corps.
21 August 2012, 11:58 AM ET
NASA's twin probes are going where no one has gone before.
20 August 2012, 03:02 PM ET
Is the Cydonia rock formation a sign of life or a trick of light?
17 August 2012, 05:35 PM ET
Astronaut, scientist, physician, teacher – Mae Jemison wears many different hats.
17 August 2012, 05:33 PM ET
The sun is a big ball of hot gases.
15 August 2012, 07:04 PM ET
Heat and light from the sun make life on Earth possible.
14 August 2012, 12:30 PM ET
The constellation Taurus charges through the northern winter sky.
10 August 2012, 05:42 PM ET
The first Indian-born woman in space died when the space shuttle Columbia broke up on re-entry.
10 August 2012, 04:07 PM ET
This dim constellation was not defined until 1930.
09 August 2012, 04:22 PM ET
Rocky surfaces and molten cores are what the four inner planets of the solar system have in common
09 August 2012, 12:41 PM ET
This large constellation contains the bright star Spica and many exoplanets and deep space objects.