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Scientific America – Newfound ‘Quasi-Moon’ Has Been Earth’s Fellow Traveler for Thousands of Years

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Astronomers have identified asteroid 2023 FW13 as a “quasi-moon” or “quasi-satellite,” meaning it orbits the sun in a similar timeframe as Earth but is only slightly influenced by Earth’s gravity. This asteroid, about 50 feet in diameter, orbits the sun while also circling Earth, coming within 9 million miles of our planet.
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