Journey into the Abyss: Navigating the Perils and Wonders of Black Holes Opens in a new window www.nasa.gov Black holes are some of the most mysterious and fascinating objects in the universe. They are so dense that not even light can escape their gravitational pull, hence the name "black hole". Scientists believe that black holes are formed when massive stars collapse at the end of their lives. The force of gravity is so strong that the star implodes, creating a singularity , a point of infinite density and zero volume. Black holes come in different sizes, ranging from small stellar black holes to supermassive black holes that can be billions of times the mass of the Sun. The existence of black holes was first proposed by Albert Einstein in his theory of general relativity . However, it wasn't until the 1970s that scientists were able to provide concrete evidence of their existence. One of the most famous evidence of black holes is Cygnus X-1 , a black hole located i...
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