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How did they know about the black hole? observations
History of black hole discovery
Black Hole is an infinitely small point?
One that failed to become Black hole, becomes white dwraf or neutron star
Heating of particleswhen entering
In a single observation, the STIS measured the velocities of hundreds of gas blubs caught up in a twin-cone beam of radiation emanating from a super massive black hole at the core of galaxy. Follow by observations reveal hot gas emanating from deep within the throat of the beam, near the vicinity of the black hole.
Do all galaxies have black holes at their centers? Although not even a single galaxy has yet been proven to have a central black hole, the list of candidates continues to increase. Results by astronomers using instruments like the Hubble Space Telescope now indicate that most - and possibly even all - large galaxies may harbor one of these dense beasts. In all the galaxies studied, star speeds continue to increase closer the very center. This in itself indicates a center millions of times more massive than our Sun is needed to contain the stars. This mass when combined with the limiting size make the case for the central black holes.
