The story starts in 2017 when astronomers working on the Pan STARRS telescope in Hawaii spotted the first interstellar asteroid ever observed – Oumuamua (below), an object measuring about a quarter of a mile long.
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https://www.techspot.com/news/99328-alien-technology-or-natural-phenomenon-interstellar-meteor-material.html?utm_source=dlvr.it&utm_medium=blogger