21 January 2015, 08:11 PM ET
NASA's Messenger mission has spent several years mapping Mercury, which was poorly understood for decades.
20 January 2015, 09:17 PM ET
Mars Odyssey is the longest-serving spacecraft to visit Mars.
15 January 2015, 10:02 PM ET
The European spacecraft made some surprising discoveries during its eight-year mission to the second planet from the sun.
14 January 2015, 10:57 PM ET
Scaled Composites has been aiming toward commercial spaceflight for more than a decade.
13 January 2015, 10:00 PM ET
The universe was born with the Big Bang as an unimaginably hot, dense point. SPACE.com offers an overview of the universe and its history, age and structure.
08 January 2015, 01:20 PM ET
The full moon happens once a month. Find out when.
08 January 2015, 12:45 PM ET
Find out the current moon phases. The moon cycles through eight phases every month.
31 December 2014, 11:50 AM ET
The Geminids come from an asteroid, 3200 Phaethon, but scientists are still trying to figure out exactly how it sheds enough debris to produce the bright meteor shower.
31 December 2014, 09:00 AM ET
January'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.
22 December 2014, 09:45 PM ET
Comet ISON, discovered by two amateur astronomers in Russia, arrived in Earth's neighborhood in November 2013 and apparently broke up as it rounded the sun.
22 December 2014, 04:05 PM ET
SpaceShipTwo should start flying paying customers into space sometime in 2015, Virgin Galactic founder Richard Branson has said.
22 December 2014, 12:13 PM ET
Entrepreneur Richard Branson aims to take paying passengers into space in the next few years.
20 December 2014, 03:42 AM ET
Orion's Belt is an asterism of three stars that appear about midway in the constellation Orion the Hunter. The stars are so called because they appear to form a belt in the hunter's outfit.
19 December 2014, 01:14 AM ET
The Summer Triangle is a Northern Hemisphere asterism (star pattern) that is actually an amalgamation of stars from three separate constellations.
18 December 2014, 03:10 AM ET
The Little Dipper is an asterism (star pattern) in the larger constellation of Ursa Minor, the Little Bear. The most famous star in the constellation is Polaris.
16 December 2014, 10:58 PM ET
The two-year mission of the one-ton rover is to find out if Mars is, or was, capable of supporting life.
16 December 2014, 09:41 PM ET
Learn how stars form, how stars and constellations are named, what happens when stars like our sun evolve, and ultimately, die.
11 December 2014, 10:49 PM ET
Earth is the only planet known to support life. Learn about Earth science facts and the planet’s interior composition, surface and atmosphere.
09 December 2014, 10:17 PM ET
Learn how our solar system formed, how it was discovered and the names of the planets, dwarf planets and regions of space that orbit our sun.
09 December 2014, 01:22 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
25 November 2014, 05:14 PM ET
Neptune is the farthest planet from the sun and was the first to be predicted before it was discovered.
21 November 2014, 11:38 PM ET
Learn about the size, shape and composition of asteroids as well as their history, naming conventions, and plans to mine asteroids in the future.
21 November 2014, 09:15 PM ET
Lockheed Martin has been involved in aviation and space exploration for about 100 years.
20 November 2014, 09:48 PM ET
Read about the history and future of Earth’s sun as well as fun facts about the sun’s age, size, temperature, and phenomena like solar flares.
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.