Scientists hunting for signs of alien life shouldn't be so quick to dismiss carbon monoxide, a new study suggests.
An alien planet that orbits a star other than our sun is referred to as an "exoplanet." Learn more about the types of alien planets, including exoplanets and extrasolar planets, and get the latest news.
Many alien planets around stars like our sun are potentially extraordinarily tilted, leading to dramatic swings between extreme winters and summers, a new study finds.
NASA's recently deceased Kepler space telescope launched on March 6, 2009, ushering in a new era of planetary science.
The find is a fitting tribute to Kepler, which has discovered nearly 70 percent of all known exoplanets.
Crashing a giant space rock into a young planet can strip off some or all of its atmosphere, creating a wealth of different types of worlds.
Astronomy may focus on the stars, but occasionally something happens to bring it back down to Earth — like a swarm of insects shorting out their telescope.
NASA's Transiting Exoplanet Survey Satellite (TESS) has discovered a 'sub-Neptune' planet orbiting the star HD 21749, which lies about 53 light-years from Earth.
Oxygen may not be quite as compelling a sign of alien life as astrobiologists had thought, a new study suggests.
A gaseous alien world is evaporating at a record rate, shedding considerable light on an exoplanet mystery, a new study reports.
NASA's Kepler Space Telescope was revolutionary space telescope dedicated to finding planets outside our solar system.
One of seven planets orbiting a small star, TRAPPIST-1, may be capable of supporting life as we know it on Earth, new climate models suggest.
NASA decommissioned the Kepler space telescope last night (Nov. 15), beaming "goodnight" commands to the sun-orbiting observatory.
There appears to be a cold "super-Earth" planet circling Barnard's Star, which lies just 6 light-years from the sun. Here's what you should know about the newfound planet candidate.
Astronomers have found compelling evidence of a frigid alien world about 3.2 times more massive than Earth circling Barnard's Star, a dim red dwarf that lies just 6 light-years from the sun.
Vega, historically one of the most-studied stars, is under scrutiny in modern times because it may have planets.