Rogue Black Hole in the Milky Way

One of the early thoughts of what dark matter might be is just rogue black holes. Random neutron stars that we couldn't see cold white dwarfs. Researchers set up two different long term observational programs, Ogle and Macho. One was pointed towards the center of our Milky Way galaxy looking for them to brighten and fade away as something passed in front of them. But over the years they have firmly seen one seven solar mass black hole that over a long period of time gradually passing in front of a background star with its gravity. And that that is our our prototype for rogue black holes in the Milky Way.

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