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Unsealed: Alien Files - Alien Communications

Seizoen: 4 - Aflevering: 18 / 103 - Eerst uitgezonden: 01 december 2015 - Episode ID: 1391647

Scientists and Ufologists are scouring the vast regions of space for signs of extraterrestrial life. But if it takes millions of years for light from distant stars to reach Earth, how long could it take for aliens to answer our call?