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Unformatted text preview: mass but otherwise loses its density The event horizon of a 3 Msun black hole is also about as big as a small city. It increases with black hole masses If the sun shrunk into a black hole, its gravity increases with black hole masses Black holes The event horizon is where the escape velocity equals the speed of light. Once across, nothing can come back out Anything would become a black hole if compresses enough There are only holes in the observable universe...
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- Winter '09