Most comets and asteroids that pass through the Solar System are permanent residents. The Sun’s gravity keeps them on closed orbits, even when those orbits take thousands of years to complete. An interstellar object is different. It arrives on a path that is not closed around the Sun. The object is passing through, and after […] The post What Is an Interstellar Object, and How Do Astronomers Know It Came From Another Star? appeared first on Curi…
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