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Wikenigma - an Encyclopedia of Unknowns Wikenigma - an Encyclopedia of the Unknown

Galaxy formation

There are currently two (mutually exclusive) theories regarding the formation of galaxies, which according to current models, all have a supermassive Black Hole at their centre.

1) The galaxy formed around a pre-existing Black Hole which was sufficiently massive as to attract all the nearby stars.

2) The galaxy formed first, and the Black Hole then formed by the merging of stars at its centre.

Further information. In Out Time , BBC audio discussion.


Also see :Galaxies (definition of)plugin-autotooltip__plain plugin-autotooltip_bigGalaxies (definition of)

"“What exactly is a galaxy? Surprising as it may sound, astronomers don't have an answer to this fundamental question. There's no agreement on when a collection of stars stops being a cluster and starts being something more.
and Gravitational singularitiesplugin-autotooltip__plain plugin-autotooltip_bigGravitational singularities

"A gravitational singularity, spacetime singularity or simply singularity is a location in spacetime where the mass and gravitational field of a celestial body is predicted to become infinite by general relativity in a way that does not dep…


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