02 August 2012, 03:16 PM ET
Mars is the second smallest planet in the solar system. Here are Mars’ diameter, mass and other size measurements
01 August 2012, 10:58 AM ET
Many cultures have recognized this constellation as the Lion.
31 July 2012, 11:11 AM ET
The world's greatest flying machines helped humans not only get off the ground, but also fly into space.
30 July 2012, 02:12 PM ET
The constellation Gemini is easy to spot in the northeastern sky.
30 July 2012, 11:25 AM ET
Ten of the greatest moments in flight took humans from flying in hot-air balloons to stepping foot on the moon.
27 July 2012, 04:12 PM ET
The space shuttle program paved the way for missions that extend farther out into the solar system and beyond.
27 July 2012, 10:51 AM ET
The V-22 Osprey takes off like a helicopter and flies like an airplane.
26 July 2012, 01:37 PM ET
Salyut 1, the first space station, paved the way for future manned orbital platforms.
25 July 2012, 03:39 PM ET
Millions of people watched as Neil Armstrong took the first steps on the moon.
25 July 2012, 02:59 PM ET
Sally Ride was the first American woman to go into space.
25 July 2012, 01:32 PM ET
One of the dragon constellation's stars used to be the North Star
25 July 2012, 11:31 AM ET
The ISS is the most complex scientific and technological endeavor ever undertaken.
24 July 2012, 06:25 PM ET
Pegasus has some interesting galaxies and deep-space objects.
24 July 2012, 02:00 PM ET
The Russians won an early victory in the space race when they launched Yuri Gagarin into orbit.
23 July 2012, 04:43 PM ET
In 1947, pilot Chuck Yeager flew faster than the speed of sound, and also created the first sonic boom.
23 July 2012, 11:44 AM ET
To get astronauts to the moon, scientists built the largest rocket ever.
20 July 2012, 05:08 PM ET
Charles Messier compiled a catalog of more than 100 fuzzy objects, known as nebulae.
20 July 2012, 01:27 PM ET
"Lucky Lindy" electrified the world and changed public opinion about air travel.
20 July 2012, 10:00 AM ET
A stealthy, supersonic spy plane from the Cold War set world speed and altitude records for manned jet aircraft.
19 July 2012, 04:46 PM ET
The Orion constellation is one of the most prominent star patterns in the sky.
19 July 2012, 01:00 PM ET
The first scheduled passenger airline service took off from St. Petersburg, Fla.
19 July 2012, 10:00 AM ET
Nazi Germany's Me 262 fighter jet influenced later generations of U.S. military aircraft as the world's first operational turbojet aircraft.
18 July 2012, 02:00 PM ET
The Wright Brothers’ first plane flight in Kitty Hawk lasted just 12 seconds in 1903, but Orville and Wilbur made history in that airplane, the Flyer
18 July 2012, 10:00 AM ET
The zeppelin Hindenburg represented the largest aircraft to ever fly before it met a fiery end in the disaster bearing its name.
17 July 2012, 01:27 PM ET
For lighter-than-air travel to get anywhere, a way to control the balloons had to be invented.
17 July 2012, 09:00 AM ET
World War I transformed aircraft into flying weapons and harnessed aviation technology to the military.
16 July 2012, 09:32 AM ET
The 1903 Wright Flyer that made history's first flight included propellers and wire controls.
16 July 2012, 09:16 AM ET
The Montgolfier brothers launched the first flight of a hot-air balloon in 1783.
11 July 2012, 12:12 PM ET
Using the Hubble Space Telescope, astronomers have discovered a fifth moon orbiting the dwarf planet.
10 July 2012, 06:43 PM ET
Heated by a nearby star, this cloud of gas and dust forms the familiar shape of an equine head.
05 July 2012, 05:33 PM ET
With a total of 67 known moons — including four large moons known as the Galilean satellites — Jupiter almost qualifies as a solar system unto itself.
05 July 2012, 04:25 PM ET
Callisto is thought to be a long dead world, with hardly any geologic activity on its surface.