A super-Earth planet that dips in and out of its star's habitable zone has been discovered just 19.7 light-years away.

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

There's a new race in space, but it's not where you might think. It's happening close to home – in the nearest bit of space, ...

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

Why it's so special: These odd, fan-like features on the surface of Mars are geysers of gas and dust near the planet's south ...

Witness a rare celestial spectacle as seven planets align in the night sky for one night in late February, offering a ...

By tracing the corkscrew wobble of two stars as they move through the sky, the Gaia space mission has discovered one new ...

A planet that may support alien life has been discovered less than 20 light-years away from Earth - and it's believed to ...

Scientists found an intriguing world in our galaxy.

Gaia-4b is considered a super-Jupiter planet, a relatively cold gas giant, orbiting its star over 570 Earth-days. That star ...