Lunar Formation
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Description: Where did the moon come from? This site explores the answer to that question.
SwRI Spring 1999 Technology Today Article Theoretical and computational simulations at SwRI could soon explain how the Earth came to have its orbiting neighbor. About 4.45 billion years ago, a young planet Earth -- a mere 50 million years old at the time -- experienced the largest impact event of its history. Another planetary body with roughly the mass of Mars had formed nearby with an orbit that had, by chance, placed it on a collision course with Earth. When young Earth and this rogue body collided, the energy involved was 100 million times larger than the much later event believed to have wiped out the dinosaurs. The early giant collision destroyed the rogue body, likely vaporized the upper layers of Earth's mantle, and ejected large amounts of debris into Earth orbit. From this debris our moon coalesced, possibly on a time scale as short as one to 100 years.
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| Date | Creation Date: 1995-02-02T05:00:00Z Expiry Date: 2024-02-03T05:00:00Z |