Scout -- The farm -- Anomalies -- StarChips -- The lightsail hypothesis -- Seashells and buoys -- Learning from children -- Vastness -- Filters -- Astro-archaeology -- ʻOumuamua's wager -- Seeds -- Singularities.
Summary
Harvard's top astronomer lays out his controversial theory that our solar system was recently visited by advanced alien technology from a distant star. In late 2017, scientists at a Hawaiian observatory glimpsed an object soaring through our inner solar system, moving so quickly that it could only have come from another star. Astrophysicist Avi Loeb showed it was not an asteroid; it was moving too fast along a strange orbit and left no tail of gas or debris in its wake. There was just one conceivable explanation: the object was a piece of advanced technology created by a distant alien civilization.