One million to one billion times the mass of the Sun. They would be about the size of our solar system. HST's View fo the Jet in Galaxy M87 HST's view of the accretion Disk in Galaxy NGC 4261. An astronaut visits a gigantic black hole at the center of our Milky Way Galaxy before returning to an Earth far in the future. The Doomsday Effect by Thomas Wren The Earth's gravity captures a micro-black hole which begins to consume the planet.
Scientists race to find a way to stop it.
Neutron Stars Page Dr. Robert Nemiroff generated these graphics illustrating how the Earth and sky would appear if the Earth were compressed to the size of a neutron star or black hole. Some astronomers now believe they have a way to positively identify black holes when they accrete matter from other stars. The Hubble Telescope has photographed Black Holes in other galaxies. There is exciting new evidence that black holes may reside in the centers of many galaxies. Ask a High Energy Astronomer .