Black HolesThe wormhole itself is two copies of the black hole geometry connected by a throat - the throat, or passageway, is ...
http://imagine.gsfc.nasa.gov/docs/science/know_l2/black_holes.html
Black HoleThe massive black hole captures nearby stars and ... To learn more about black holes, see also Black Holes and Beyond ...
http://heasarc.gsfc.nasa.gov/docs/blackhole.html
Imagine the Universe: Black HolesBlack Holes. Information and Activity Books ... However they're not maintained by us and the content may have changed. ...
http://imagine.gsfc.nasa.gov/docs/teachers/blackholes/blackholes.html
Black HolesBLACK HOLES. Introduction to black holes. Observational evidence for black holes. Black holes and critical phenomena ...
http://www.damtp.cam.ac.uk/user/gr/public/bh_home.html