The first serious exomoon candidate is likely the captured core of a baby giant planet, if the exotic world does indeed exist, 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.
Alien worlds resembling giant eyeballs might be able to host life, but they may not be as common as previously suggested, a new study finds.
Astronomers have discovered a giant, Jupiter-like planet in an unexpected location, and it's orbiting a small, nearby red dwarf star, a new study finds.
Astronomers have identified a half dozen exoplanets that may be made of an exotic form of matter unknown on Earth.
Water vapor, and likely clouds that rain liquid water, have been discovered on an exoplanet that lies in the habitable zone of its star. But there's an issue.
Astronomers are finding more and more alien worlds that may be capable of supporting Earth-like life, but none of them so far are carbon copies of our home world.
In a major first, scientists have detected water vapor and possibly even liquid water clouds on a strange exoplanet that lies in the habitable zone of its host star about 110 light-years from Earth.
Scientists may have found a volcanic world on the verge of destruction, where the chances of finding life are highly unlikely.
If HR 5183 b were magically dropped into our solar system, the planet's orbit would reach inside that of Jupiter but extend way out beyond the path of Neptune.
Earth's dazzling biodiversity may not be so remarkable in the cosmic scheme of things, a new study suggests.
The solar system around a star called Beta Pictoris was already a pretty interesting place, with a large planet scientists have actually seen and a huge amount of rubble flying around.
A nearby, rocky exoplanet may be just a plain rock with no atmosphere — supporting a theory that planets orbiting small stars are more susceptible to lacking an atmosphere.
Ground and space telescope missions plan to further explore exoplanets discovered by NASA's TESS spacecraft.
The James Webb Space Telescope could gather critical information about the atmospheres of planets in the TRAPPIST-1 planetary system, one new study finds.
The surviving cores of planets orbiting dead stars emit radio waves that scientists can detect from Earth for up to a billion years, one new study has found.