Since Pluto was relegated to dwarf planet status, almost everyone has agreed that there are eight planets in our solar system ...

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?

Planets that orbit white dwarf stars should be too hot to host alien life, theories suggest. But a new study accounting for ...

A low-density, puffy planet orbiting relatively far from a young star in a nearly perpendicular orbit. What's going on?

The Copernican Principle, named in honor of Nicolaus Copernicus (who proposed the heliocentric model of the Universe), states ...

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

After marking the 30th anniversary of the discovery of the first exoplanet around a sun-like star, we now look forward to ...