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2015-2020
What Do Alien Civilizations Look Like? The Kardashev Scale
Kurzgesagt – In a Nutshell
11:41
Aug, 2020
17.3M
What's Out There?
jschlatt
04:20
Dec, 2016
215.8K
Universe Size Comparison 2
Harry Evett
08:07
Jan, 2017
189.3K
How Many Aliens are There?
Dreksler Astral
06:30
Apr, 2018
57.4K
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