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.
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
Strictly, black holes don't actually lead anywhere, as they are not holes in the common sense of the term. According to the Harvard Smithsonian Center for Astrophysics, black holes are regions of the universe in which matter has become so dense that nothing, not even light, can escape its gravitational pull. Within this volume, the original matter has become so compact that it can fairly be said to have disappeared.Full Answer >
Interstellar bubbles are made when stellar winds caused by massive stars or supernovae push the interstellar gas around them outwards in a bubble shape. Stars clustered close enough together form giant bubbles when their bubbles merge. These giant bubbles are known as superbubbles.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 >
Star type M, the red stars, are the coolest stars with an average surface temperature of under 3,500 K. This type of star has a 0.3 solar mass (M☉) and an average radius of 0.4 solar radius (R☉). Examples of red stars are Betelgeuse and Antares.Full Answer >