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

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

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

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 have recently discovered a fascinating exoplanet named TOI-4507 b, which is larger than Jupiter yet possesses an ...

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

For almost a decade, astronomers have been searching for a ninth planet in the solar system. Recently, new evidence of ...

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

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

On October 6 1995, at a scientific meeting in Florence, Italy, two Swiss astronomers made an announcement that would transform our understanding of the universe beyond our solar system. Michel Mayor ...

Astronomers have discovered new evidence that suggests the possibility of an unknown planet in our solar system's farthest ...

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 ...