Astronomers have found GJ 251 c, a rocky planet. It is a super-Earth located only 18 light-years away. This planet is in its ...

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

Astronomers are gathering evidence of a massive hidden planet lurking beyond Neptune.

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

Earth and the sun in our solar system - Drpixel/Getty Images When you see art of our solar system as the planet orbit the sun, you may notice that Earth's orbit has a tilt. It is not a perfect circle.

Material around Chiron, a small icy world in the far reaches of the solar system, may be taking shape into a ring system of ...

What's special about Chiron's rings is that they're still forming; this marks the first time astronomers have ever seen a ...

The Hubble Space Telescope time-lapse captured footage of Jupiter, Saturn, Uranus and Neptune. Credit: SCIENCE: NASA, ESA, ...

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

A new analysis estimates that the asteroid belt is steadily losing mass each year, and may not be as permanent a feature of ...