An artist's impression of a black hole and its accretion disc, which
occurs when large amounts of superheated gas and dust are torn off a companion
star (or left nearby the black hole after the star from whence it came perished),
and rotates around the black hole at very fast velocities.
(http://physics.syr.edu/courses/PHY312.98Spring/projects/jebornak/html/finding.html)

This is the primary way that black holes are formed.
http://starchild.gsfc.nasa.gov/docs/StarChild/shadow/universe_level2/black_holes.html

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