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Transcript of Black Holes
A Black Hole is a part of space from which nothing, including light, can escape. A black hole is actually invisible. The reason we can see it is because it absorbs all the light that hits it, reflecting nothing, making it completely black. Black holes are made when high-mass stars die in a spectacular supernova explosion. The explosion, which lasts only seconds, blows most of the star apart.
Low-mass stars die then slowly shed their outer layers. These layers can glow for thousands of years. The star is then called a planetary nebula.
Black holes warp time. If you dropped a clock in a black hole, it would stop going. In the strictest and most exact sense, there are currently 14 known black holes.