The TNO, which are described as minor planets that orbit the sun at a greater distance than Neptune, were found on the edge ...

Scientists like to refer to our planet as residing in the "Goldilocks zone," where it's neither too hot nor too cold, and ...

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

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

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.

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

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.

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

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

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

Scientists have recently spotted a huge object far away in the cold outer reaches of our solar system. This ...

The lone planet confirmed to be in the system is squeezed in between the two, orbiting at a distance similar to Earth's ...