Black+Holes

=Black Holes= When big stars explode some leave behind masses of gravity called black holes. 50 million light years from earth a 30-year old black hole has been discovered. The black hole could help scientists better understand how massive stars explode, which ones leave behind black holes or neutron stars, and the number of black holes in our galaxy and others.It is the nearest example where the birth of a black hole has been observed of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusets.The scientists think the black hole first discovered by an astronomer in 1979, formed when a star about 20 times more massive than the sun collapsed. Many new black holes in the distant universe previously have been detected in the form of gamma-ray bursts, but SN 1979C is different because it belongs to a class of supernovas thatgamma-ray bursts are not produced. This is the first time the common way of making a black hole has been observed. It is very hard to find this type of black hole birth because decades of X-rays are needed.