An unexpected monster black hole was found hiding inside one of the Milky Way's tiniest neighbors, rewriting what scientists thought they knew about how small galaxies hold themselves together.
Segue 1 is an ultra-faint dwarf galaxy located about 75,000 light-years from Earth, making it a very close neighbor of the Milky Way. Advanced modeling technologies revealed that the galaxy appears to be dominated not by dark matter as long believed, but rather by a central black hole roughly 450,000 times the mass of the sun, according to a statement from the University of Texas McDonald Observatory.
