Explore Ceres, the largest asteroid in our solar system, and discover its remarkable ancient ocean and ice-rich crust.

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

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

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

Venus, Mars, Jupiter, Saturn ... There are eight planets in our solar system, nine if you count dwarf power planet Pluto. Because we live on Earth, the max number of planets we can see from ...