Earth, HD 20794 d, orbiting a nearby sun-like star, offering a promising lead in the search for life beyond our planet.

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

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, ...

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

Here’s what you should know when you go outside to see for yourself: Yes, the planets are indeed lined up across our sky. No, ...

For decades, Pluto was celebrated as the ninth planet of our solar system. However, in 2006, the International Astronomical ...

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 ...

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

Spotting one or two of the planets in our solar system is well worth a good skywatch, but seeing (almost) all of them in a ...

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

Edward Bloomer, an astronomer at the Royal Observatory in Greenwich, England, explains that this discovery has more to do with the observation of orbits of other planets. "In about 1604 ...