As of 2010, the closest known black hole to Earth is V4641 Sgr. According to Tega Jessa of Universe Today, V4641 Sgr is located in the Sagittarius arm of the Milky Way galaxy and was first discovered in 1999. This black hole is 1600 light years from Earth.Continue Reading
Black holes are the last stage in a star's life cycle, forming when a star collapses under the weight of its own gravity, explains Jessa. They are discovered using radio telescopes, which detect radioactive emissions from matter that falls into them.
Based on Einstein's theory of general relativity, objects can fall or be pulled into a black hole, but they can never reappear. Because black holes are basically invisible, scientists rely on the observation of matter surrounding the possible location of a black hole.Learn more about Stellar Astronomy
Although it is true that the larger the star is, the longer it lives, it is also true that a high mass star will die sooner because it burns through hydrogen more quickly. The faster the fuel in a star is consumed, the shorter its lifespan will be.Full Answer >
The Milky Way Galaxy is made out of dark matter, dust, gas and billions of stars. Scientists believe that most of the Milky Way is made out of dark matter.Full Answer >
Stars do die. The nuclear fusion reaction in stars stops and the star shrinks into a white dwarf due to gravity. The white dwarf further shrinks by releasing energy and becomes a black dwarf, when no energy is released either by fusion or by shrinking.Full Answer >
The CNO cycle is the nuclear fusion process in stars that involves proton fusion of carbon, nitrogen and oxygen as a catalyst. This occurs in stars with temperatures about 15 million Kelvin.Full Answer >