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Earth Sized Diamond

Astronomers have discovered a white dwarf star 900 light years from Earth that is the coolest ever found. White dwarfs are mostly made of carbon and this star is cool enough for the carbon to have crystalized--in effect, creating an Earth sized diamond with the mass of the Sun! The white dwarf is completely invisible due to it's low temperature. It was discovered by analyzing the behavior of a companion pulsar (a rapidly rotating neutron star broadcasting strong radio waves from it's poles). This pair is the remains of a massive star that exploded in a supernova leaving behind the neutron star and a smaller companion that eventually used up what nuclear fuel it could and collapsed into the white dwarf.