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What Is a Black Hole?

What Is a Black Hole?

Black holes seems to break all the rules: Nothing escapes from them, time slows, and no one can see inside.

Comet Pons-Brooks Puts on a Show

Comet Pons-Brooks Puts on a Show

Comet 12P/Pons-Brooks is exciting observers with a recent outburst that caused it to temporarily become 100 times brighter!