The colossal black hole lurking at the center of the Milky Way galaxy is spinning almost as fast as its maximum rotation rate. That's just one thing astrophysicists have discovered after ...

Essentially, galaxy clustering constraints on σ 8 probe the growth of structure from the early universe (where we have precise measurements thanks to the cosmic microwave background) to late times.

Astronomers have smashed the record for the largest-known cloud of energetic particles discovered surrounding a galactic cluster—and the find could shake up established physics. The cluster in ...