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Q& A: Black Holes
Q:
Do all black holes has to be massive objects? Do all black holes
have to be dense?
A:
For the various types of black holes known to exist, see: http://chandra.harvard.edu/xray_sources/bh_midmass.html
If you were on a space ship that ventured beyond the event
horizon of a supermassive black hole, it might not seem too
different from ordinary space. However, that feeling would soon
pass, as your spaceship would be pulled in a death spiral toward
the center of the black hole in matter of a minutes.