The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

When astronomers found a large world farther out than Pluto, it became one of the final nails in the coffin of our ninth ...

The organic material found in a few areas on the surface of dwarf planet Ceres is probably of exogenic origin. Impacting ...

Planets with suns like Wolf 359 are subject to huge blasts of radiation that raise questions about their long-term ...

Bright yellow deposits in Consus Crater provide new evidence of Ceres' cryovolcanic history, reigniting the debate over ...

The building blocks of life could have been delivered to solar system dwarf planet Ceres by one or more space rocks from the ...

Scientists studying samples that NASA collected from the asteroid Bennu found a wide assortment of organic molecules that shed light on how life arose.

The dwarf planet is a bizarre, cryovolcanic world. However, the organic deposits discovered on its surface so far are unlikely to originate from its interior. The organic material found in a few areas ...