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

A newly discovered warp in the outer Solar System may have been created by a small, rocky world, much closer to the Sun than ...

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

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

A recent study by Princeton University astronomers suggests the possible existence of a previously undetected planet in our ...

Just a few weeks ago, we crossed the significant milestone of 6,000 known exoplanets. The counter keeps getting higher, and there are 8,000 more candidates waiting for confirmation. In the decades ...

The James Webb Telescope captures the beginning of planetary formation around the young star HOPS-315 for the first time.

Did NASA find another Earth? Scientists look to the sky to find a copy of our planet, and some experts think they may have ...

This is peculiar, but it is not the first marshmallow planet discovered. Others have sported this extreme low density. What's ...

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

Astronomers are investigating a strange class of exoplanets known as eccentric warm Jupiters — massive gas giants that orbit their stars in unexpected, elongated paths. Unlike their close-orbiting ...

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