Earth wobbles on its axis like a spinning top, a motion called precession. This wobble takes about 26,000 years to complete one full circle. Different stars have served as the North Star throughout ...
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Einstein's relativity could rewrite a major rule about what types of planets are habitable
The habitable zone — the region where temperatures are just right to support liquid water on a planetary surface — around white dwarfs spans somewhere from a tenth to a hundredth the distance between ...
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