Reference Pages
19 November 2014, 10:35 PM ET
The Orion Multipurpose Crew Vehicle is NASA's planned spacecraft to take astronauts into space beyond Earth orbit. The agency plans to run the first test flight of the spacecraft in December 2014, with crewed missions possibly following in the early 2020s
19 November 2014, 08:40 PM ET
Learn how Earth’s moon formed, how its orbit affects Earth’s tides, why solar and lunar eclipses happen and the history of lunar exploration.
18 November 2014, 09:17 PM ET
Learn about the history of Uranus (and how it got its name) as well as the physical characteristics of the planet including its rings and moons.
17 November 2014, 10:25 PM ET
Learn about the physical characteristics of Saturn and its famous rings, what we know about Saturn’s moons and Saturn’s roots in Greek mythology.
17 November 2014, 11:20 AM ET
Rosetta is a spacecraft launched by the European Space Agency with a 10-year mission to rendezvous with a comet.
15 November 2014, 12:46 AM ET
Learn about the composition and orbit of comets, as well as the history of their discovery, famous comets and space missions to analyze them.
14 November 2014, 12:59 AM ET
Jupiter is the largest planet in our solar system, and is known for its many moons, its dangerous radiation belt and its iconic Great Red Spot.
12 November 2014, 10:38 PM ET
The Big Dipper is an asterism in the constellation Ursa Major. The familiar group of stars serves as a pointer to other locations in the sky.
12 November 2014, 08:20 PM ET
Lick Observatory, in operation since 1888, is involved in the search for planets outside the solar system.
05 November 2014, 03:55 PM ET
Orbital Sciences Corp. is slated to be the second private American company to dock a spacecraft with the International Space Station.
04 November 2014, 10:00 PM ET
Mercury is the smallest planet in our solar system and is known for its short years, long days, extreme temperatures and weird sunsets.
04 November 2014, 09:01 PM ET
Venus is the brightest planet in our solar system, has a hellish atmosphere, and is covered in volcanoes. Learn more about planet Venus here.
04 November 2014, 09:00 PM ET
Learn about planet Mars’ atmosphere, water supply and the possibility to support life, plus, findings from the Mars exploration rover mission.
03 November 2014, 11:04 PM ET
Learn about the discovery of dwarf planet Pluto, its fascinating orbit and atmosphere and the controversy surrounding its planetary status.
03 November 2014, 04:00 PM ET
November's sky includes eclipses of the moon and sun, as well as comets and more. Find out what's up in your night sky and how to see it in this Space.com stargazing guide.
24 October 2014, 03:00 PM ET
Total solar eclipses are one of nature’s grandest events. What is a total solar eclipse? How do they work? And when is the next one? We explain.
09 October 2014, 11:00 AM ET
Lunar eclipses occur when Earth's shadow blocks the sun. There are three types: The most dramatic is a total lunar eclipse. Find out when is the next one.
02 October 2014, 04:20 PM ET
SpaceShipOne launched the era of private spaceflight.
02 October 2014, 04:05 PM ET
SpaceShipTwo should start flying paying customers into space sometime in 2015, Virgin Galactic founder Richard Branson has said.
25 September 2014, 01:00 PM ET
NASA's Mars probe is expected to study the atmosphere of the Red Planet in amazing new detail.
20 August 2014, 10:37 PM ET
Kitt Peak National Observatory, high atop a mountain in the Arizona desert, is home to 24 telescopes. Frequent clear skies helped make it a site of many notable discoveries.
15 August 2014, 10:02 PM ET
Yerkes Observatory is most noted for its work on stellar motion and cartography, and it's also where the atmosphere of Saturn's moon Titan was discovered.
18 July 2014, 01:31 AM ET
Mount Wilson Observatory is a Los Angeles-area facility with several telescopes open to astronomers and the public.
28 June 2014, 01:10 AM ET
The twin telescopes at the W.M. Keck Observatory are the largest optical and infrared telescopes in the world. The telescopes are located atop Mauna Kea, a dormant volcano in Hawaii.
20 June 2014, 03:11 AM ET
The Palomar Observatory is an astronomical research center where several small worlds were discovered near the edge of the solar system.
12 June 2014, 01:02 AM ET
Astrophysics is a branch of space science that applies the laws of physics and chemistry to seek to understand the universe and our place in it.
11 June 2014, 04:28 AM ET
Chuck Yeager was an American test pilot who was the first person to break the sound barrier — the point where a speeding object (such as an airplane) passes the speed of sound.
31 May 2014, 03:54 AM ET
The exact number of stars is impossible to know because we aren't sure how big the universe is.
29 May 2014, 12:39 AM ET
Grasshopper was a reusable rocket prototype tested by the company SpaceX in preparation for more ambitious launches.
22 May 2014, 09:28 PM ET
Many astronomers define a planet as an object that orbits the sun (but not another object), is round (or nearly so) and has cleared the area around its orbit.
21 May 2014, 11:10 AM ET
Astronomers have several ways to count stars, but getting a definitive answer to how many there are in a galaxy is "surprisingly difficult."
09 May 2014, 03:11 AM ET
Quaoar is a planetoid that lies in the Kuiper Belt, a region of space beyond Pluto that is filled with icy bodies.