An alien planet orbits a star other than our sun, and is sometimes called an "exoplanet." Learn more about the types of alien planets, including exoplanets and extrasolar planets, and get the latest news.
Imagine looking up and seeing more than one sun in the sky. Today (Sept. 22), astronomers using the Hubble Space Telescope announced their discovery of a planet orbiting two stars instead of one.
Astronomers have detected a very strong radio signal that seems to come from the sunlike star HD 164595, bringing back memories of the Wow! signal of 1977. But will humanity ever truly know where these signals came from?