Exoplanets like Earth have been discovered but not all Earth-like planets are equal when it comes to alien life.

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

It looks like a sapphire jewel in space, but HD 189733bis anything but serene. With winds reaching seven times the speed of sound and clouds that pour molten glass sideways, this alien world is one of ...

A rare triple conjunction of Venus, Mars and Mercury is happening on the opposite side of the solar system to where Earth is, ...

NASA’s Hubble Space Telescope captures visible and infrared images of protoplanetary disks, showing gas and dust structures ...

Spectacular clouds swirl across the surface of Jupiter. These clouds contain water, just like Earth's, but are much denser on ...

The upcoming year will offer a blood-red moon, spectacular meteor showers and the first glimpse of the sun’s corona since ...

In theory, a planet may be able to orbit a binary star system in a figure of eight, but it may not be particularly stable, ...