Stellar | Is This Why We Haven’t Found Alien Civilizations? | Episode 5 | PBS
By Owner - STELLAR - Powered By PBSFrom pbs.org
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<p>Looking up at the stars makes you wonder: what and who is out there? And why haven’t we seen any other intelligent civilizations given the vast size and age of the universe?</p>
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Stars
Wonder
What
Intelligent
Civilizations
Vast
Size
Universe
Solar
System
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