MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
The harsh cerulean glare of a white dwarf shines down on the barren surface of a world long dead. A white dwarf is the dead core of a once normal star. They contain as much mass as a star such as the Sun but have diameters comparable to that of the Earth. As such, white dwarfs are among the densest objects in the universe, after neutron stars.
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