An alien comet passing through our solar system made its closest approach to Mars recently, and two European robotic ...

The simulation of the Solar System that came the closest to the observation was the presence of a small planet, between the ...

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

Astronomers believe they may have uncovered evidence of a hidden Earth -size planet lurking in the outer solar system. Dubbed “Planet Y”, the proposed world could be nearly twice as close to Earth as ...

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

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 ...

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?