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

The exoplanet – a planet outside our solar system – has a mass six times greater than that of Earth, and orbits in the ...

Asteroids are more than just space rocks—they come in many shapes, sizes, and compositions, with some even defying scientific ...

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, ...

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

WASP-121b is like nothing in the solar system, raining liquid metal and being puffy like a marshmallow. The origins of these ...

Though the planets are always “aligned,” seeing more than four in the sky is more uncommon. February’s lineup is a chance to ...

Enaiposha orbits a red dwarf star 47 light years away from our own Earth, upending previous theories of how planets are formed and structured and giving scientists a tempting window into the ...

A new climate modeling study presents a new scenario of how climate and life on our planet would change in response to a potential future strike of a medium-sized (~500 m) asteroid.

The acid yellow moon Io that orbits Jupiter may be less than 30% the size of Earth, but is considered the most volcanic body ...

The formation of our solar system from a singular nebula raises an intriguing question: why did each planet develop with a ...