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

A new study led by UNLV scientists sheds light on how planets, including Earth, formed in our galaxy—and why the life and ...

When you look at the solar system, you might notice that the planets' orbits are tilted, and oddities in the protoplanetary ...

Using the James Webb Space Telescope (JWST), astronomers have performed infrared observations of a planetary debris disk ...

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

Astronomers have discovered an alien world that defies every planetary rule with its massive size, low density, and tilted ...

Siraj’s Planet Y search started about a year ago when he was trying to find out whether the shape of the Kuiper Belt is flat.

We thought we understood planets, but the planetary disk chemistry of far-away XUE 10 is completely changing our conception ...

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

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