Astronomers have confirmed the existence of four rocky planets orbiting Barnard’s Star, our nearest solitary stellar neighbor ...

Pluto was once called the ninth planet, but in 2006, scientists changed its status to a dwarf planet. A planet must clear its orbit of other objects, but Pluto shares its space with many small icy ...

A new view of the Helix Nebula reveals a dying white dwarf star at the nebula's center. This star's violent eating habits could be responsible for strange X-ray emissions in the region.

Choose from Planets Background stock illustrations from iStock. Find high-quality royalty-free vector images that you won't find anywhere else. Video Back Videos home Signature collection Essentials ...

Uranus and Neptune, the most distant planets, are not visible without optical aid, though experienced observers can spot Uranus under ideal conditions. 4,5 Venus is often too bright for clear ...

The fierce debate about smartphones and adolescent mental health rests on conflicting science. Researchers and technology companies must work to improve it.