A new study has proposed the existence of Planet Y, an alternative Planet Nine candidate that is smaller and closer to Earth ...

There are a couple of ways that scientists can date planets, so which planets formed first in our solar system?

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

Our solar system is a smashing success. A new study suggests that from its earliest period—even before the last of its ...

One of the most notable properties of the giant planets in our solar system—Jupiter, Saturn, Uranus and Neptune—are the ...

Astronomers have discovered a distant dwarf planet orbiting beyond Neptune — a frozen world so far from the Sun that it ...

Just as Earth orbits the sun, most planets discovered beyond our solar system orbit a host star. But some are out there all ...

The world has suffered a devastating apocalypse. The Shlorpians are glimpsed as rotting alien skeletons in their ship, ...

From lava worlds to gas giants, NASA says the variety of these worlds is staggering—and that signs of a further 8,000 distant ...

Space scientists look back on 30 years of exoplanet discoveries — from rows of massive ‘super-Earths‘ to worlds with ...

While Planet Y has been not yet been directly observed, unexpected inclinations found in the orbits of roughly 50 distant ...

The European Space Agency also hoped to observe the interstellar object during its close approach to Mars using two ...