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

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?

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

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

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

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and Earth. The authors dubbed it Planet Y.

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

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

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

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 ...

Could a lonely planet wander aimlessly through the restless galaxy change the subtle dance of gravity within our solar system ...