These spiders hunt in packs. Watch how they do it

Physicists discover a massive problem with the search for dark matter. A recent simulation of the early universe suggests that one of the most promising targets in the hunt for dark matter — a fundamental, subatomic particle called an axion — may be twice as massive as they presumed.

When a rogue rocket hits the moon March 4, NASA orbiter will hunt for its crater grave

When a rogue rocket hits the moon March 4, NASA orbiter will hunt for its crater grave