It is a question that feels like it should have a straightforward answer: how many planets are there in our solar system?

New research from Rice University suggests that the giant planet Jupiter reshaped the early solar system in dramatic ways, ...

Billions of years after a star died, it continued influencing its surroundings in space as a white dwarf, even consuming an ...

A new study suggests yet another theory for a possible extra planet in our solar system, likely of a size between Mercury and ...

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

Astronomers are investigating a potential hidden planet, dubbed Planet Y, far beyond Neptune. Its gravitational pull is ...

Our solar system now, once again, officially consists of only eight planets. Although largely debunked, speculation continued ...

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

Astronomers are tracking strange orbital patterns in the outer Solar System that suggest a massive unseen planet may exist ...

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