What planet is most like Earth? Reseachers have identified several exoplanets similar to our planet, but none that are an ...

For all our technological progress, humanity remains confined to a single planet. But that may not always be the case. Over ...

What seemed like new planets around Fomalhaut were actually expanding dust clouds from violent planetary collisions seen by Hubble.

A newly discovered exoplanet is rewriting the rules of what planets can be. Orbiting a city-sized neutron star, this ...

NASA's planet-hunting mission, the Kepler Space Telescope, has just discovered Kepler-452b, a planet that scientists are calling "Earth 2.0." Scientists said in a press conference Thursday that they ...

Over the last three decades, astronomers have discovered more than 6,000 planets outside our solar system — yet none that look just like home. That might be about to change. A new telescope project ...

Mercury has long baffled astronomers because it defies much of what we know about planet formation. A new space mission ...

Astronomers just measured the mass of a free-floating planet without a star for the first time ...