When we factor in the size of the universe, the number of Earth-like planets, and a range of other variables, there should be tens of thousands or more extraterrestrial civilizations in the galaxy. And with the galaxy being around 10 billion years old, scientists say that intelligent worlds would have had plenty of time to contact one another. So if aliens should statistically exist, why haven’t we encountered any yet? Here are some possible reasons. Subscribe to the Listverse YouTube Channel, or read the original list here. Watch this video on YouTube Discover more extraterrestrial encounters on Listverse: 10 Government Officials Who Admitted The Existence Of Aliens 10 Bizarre Claims Of Alien/Human Hybrids 10 Creepy Stories Of Alleged Alien Encounters Top 10 Ancient Aliens Mysteries Read More: Twitter Facebook YouTube Instagram

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