Four years ago, NASA purposely smashed a spacecraft into a small asteroid to see if they could deflect it—a test to prove humanity could protect Earth from threatening space rocks.

Finding Earth-like planets orbiting sun-like stars and identifying signs of life such as oxygen or water is a major goal in ...

Step outside just after sunset and you may catch an unusual sight: six planets strung across the sky in a gentle arc. The ...

NASA’s Double Asteroid Redirection Test, known as DART, has delivered results that exceeded every benchmark the agency set ...

The planets will align in the night sky on Feb. 28. Here is when to look up and which ones are visible without a telescope.

Venus and Saturn are due up for a visually striking event known as a planetary conjunction. Here's everything to know about ...

Relative sizes of the newly discovered habitable-zone planets and Earth. Left to right: Kepler-69c, Kepler-62e, Kepler-62f and Earth (except for Earth, these are artists' renditions). Image credit: ...

Six planets are set to align on Saturday, creating a planetary parade that will be visible to sky-gazers across the globe.

NASA’s Planetary Defense Coordination Office sounds like something out of a disaster movie, but its work is far more methodical than cinematic. Instead of scrambling at the last minute, the office ...

Venus and Saturn are due for a visually striking event known as a planetary conjunction this weekend in time with daylight saving.