The SPHEREx mission will image 1 billion galaxies, 100 million stars, and 10,000 asteroids – and help to answer some of the biggest scientific mysteries.

A rare full seven-planet alignment will be visible in the early night sky between Feb. 22 and 28. We have the tips you need to best see all the planets.

Tachyons might sound like creatures ripped out of a George R. R. Martin novel, but the reality is that they refer to as-yet-non-existent particles not only capable of travelling faster than the speed ...