Are creatures from other planets visiting the earth, trampling our crops to create cryptic messages, violating people in their sleep, and doing terrible things to our livestock? How plausible is it that we are being visited by intelligent beings from beyond Earth, or that we’ve been visited in the distant past?

This week on MonsterTalk, astronomer Dr. Phil Plait, author of Death from the Skies! joins us to talk about monsters — from outer space!

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