January 29, 2026
In the mid-1840s Urbain-Jean-Joseph Le Verrier predicted the existence of an eighth planet in the solar system based on irregularities in the orbit of Uranus, then thought to be the last planet in the solar system. His calculations were so precise astronomers were able to find Neptune within an hour of looking.
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How Do We Know How Far Away the Stars Are?
The closest star, Proxima Centauri, is 4.24 light-years away. A light-year is 9.44 trillion km, or 5.88 trillion miles. That is an incredibly large distance. Walking to Proxima Centauri would take 950 million years. If you turned it up and went as fast as Apollo 11 went to the Moon, it would still
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