It turns out the Milky Way may have once been full of bustling alien civilizations, but they are all dead now.
00:00 The Milky Way is Probably Filled with Dead Civilizations
07:37 Alien Artificial Intelligence Has Existed Billions of Years Ago?
15:22 The Truth Behind the Most Mysterious Radio Signal in the Universe?
23:42 Discovery of a Huge Hole That Could Contain Extraterrestrial Life?

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