Seth Shostak Senior Astronomer: SETI Institute  Host: Big Picture Science radio show and podcast Author: Confessions of an Alien Hunter: A Scientist's Search for Extraterrestrial Intelligence

How will humanity first discover ET Life? Best guess: Technosignature Details: Large technological structures will be discovered in the next 20 years, analogous to the ancient Egyptian pyramids. Unlike signals, artifacts are always present, even when those who have built them may have disappeared.

Credits for video images  NASA planet imagery NASA, Mars Rover NASA, Cassini Orbiter Allen Telescope Array, Seth Shostak Dyson sphere, Danielle Futselaar Giant Magellan Telescope, GMTO Corporation Pyramids at Giza, Seth Shostak

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