Billions of years from now, the Sun will swell into a red giant, swallowing Mercury, Venus, and Earth. But that’s not the ...

A potential new dwarf planet has been discovered in the outer reaches of the solar system, and its existence poses the ...

Plane X would have a 'mass of about five Earths', an expert told Metro.

International researchers warn that the planet Venus is concealing at least three city-killer asteroids that could strike ...

Astronomers have discovered six asteroids that are ‘potentially dangerous to Earth’. But is there a reason to panic? Venus, ...

A series of studies have cast doubt on the sensational claim that "the strongest evidence yet" was found that life exists anywhere else besides Earth.

In the cold, dark outskirts of planetary systems far beyond the reach of the known planets, mysterious gas giants and ...

Simulations show that the stars’ tug could send Mercury, Venus or Mars crashing into Earth — or let Jupiter eject our world from the solar system.

There’s a new object in the distant reaches of our solar system, and it might just offer clues to a long-standing cosmic ...

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach ...

It's an evocative idea that has long bedeviled scientists: a huge and mysterious planet is lurking in the darkness at the ...

Twenty years ago, Congress gave NASA a directive: find 90% of the near-Earth asteroids that could potentially harm our little ...