Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

Plate tectonics give Earth its mountains, earthquakes, continental drift and maybe even helped give rise to life itself. But ...

Jupiter's Great Red Spot storm, which usually appears dark-red, can be seen shining a lurid blue color in an ultraviolet ...

Some space conspiracy theories just won't go away.

The larger moons of Pluto and Earth likely formed through a collisional process with Charon and our moon, respectively, ...

Accessible to anyone the world over, witnessing the majesty of the solar system, including the Milky Way, and its billions of ...

A once-in-a-lifetime comet is approaching the sun — and it will be visible for the first time in 160,000 years. The comet ...

There are eight official planets (sorry, Pluto) in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and ...

Astronomers have achieved a groundbreaking milestone by capturing the first-ever image an astrosphere around a star ...

A spacecraft named BepiColombo is currently zipping by planet Mercury, making a very close flyby and snapping incredible high ...

"Some of the extreme ultraviolet light above active regions flickers erratically for a few hours before a solar flare," ...

Since New Horizons' close encounter with Pluto 10 years ago, experts have come to think of the dwarf planet as much more ...