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

There are a couple of ways that scientists can date planets, so which planets formed first 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 ...

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

A mysterious space object named 2023 KQ14, nicknamed “Ammonite,” challenges theories about the mysterious and possible Planet ...

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

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

Researchers wanting to know more about the influences of multiple stars on exoplanets have come up with a new case study: a planet in a four-star system. The discovery was made at Palomar Observatory ...

Our solar system is a smashing success. A new study suggests that from its earliest period—even before the last of its nebular gas had been consumed—Earth's solar system and its planets looked more ...