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

There are a couple of ways that scientists can date planets, so which planets formed first in our solar system?

Astronomers have detected one of the darkest objects ever seen at a record cosmic distance—only with the assistance of ...

A team of astronomers has attempted to track the path of interstellar object 3I/ATLAS back into the past, tracing its path ...

Astronomers have made an unexpected and groundbreaking discovery in our solar system—a ring system forming around Chiron, a ...

We all need some space sometimes—but it's harder to find than you might think. How far into our universe do we have to go to ...

Thirty years ago, on a crisp October day in 1995, two Swiss astronomers changed the course of cosmic history. Michel Mayor ...

Asteroid ‘Families’ Reveal Hidden Histories and Impact Risks across the Solar System ...

The asteroid belt may seem permanent, but it is far from static. Its slow decline reveals a more violent past when more ...

The discovery of ancient water in a planet-forming disk reveals that some of the water found in comets—and maybe even ...

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

According to the equations that govern black holes, the larger one of these cosmic behemoths is the lower its average density ...