A planetary scientist explains new research explaining the differing compositions between space rocks that hit Earth and are brought back.

On the morning of April 21, you’ll be able to see Venus, Mercury, and Saturn low in the east — all without a telescope.

Barring any major development, Isaacman will likely be confirmed as NASA administrator by the Senate in the coming weeks. The Committee on Commerce, Science, and Transportation could approve his ...

We’ve wondered what powered the Sun for centuries. Early guesses included meteor showers, chemical combustion, and ...