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Podcast: Travelers In The Night
Episode: 141E-153-Alien Invaders
Description: The most likely alien invaders are viruses or other bits of living materials that humans have exported from or imported to Earth's biosphere. Currently there are international efforts, like the outer space treaty and the Committee on Space Research, to keep the human exploration of space from spreading Earth's life forms to other places or to contaminate our own biosphere with extraterrestrial organisms if they exist.