Alone in a Crowded Milky Way
Even a galaxy teeming with star-hopping alien civilizations should still harbor isolated, unvisited worlds—and Earth might be among them
Continue Reading https://www.scientificamerican.comEven a galaxy teeming with star-hopping alien civilizations should still harbor isolated, unvisited worlds—and Earth might be among them
Continue Reading https://www.scientificamerican.com
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