Hubble finds relic of a shredded galaxy
Astronomers know how massive stars collapse to form small black holes a few times the mass of the Sun. However, it is not clear how supermassive black holes, which can have masses of millions or even billions of times the Sun's, form in the cores of galaxies. One idea is that supermassive black holes may build up through the merger of small and mid-sized black holes, a view supported by a new study using Hubble.
Sean Farrell of the Sydney Institute for Astronomy in Australia and the University of Leicester, UK, discovered a middleweight black hole in 2009 using the European ...




