Including results for alien theory 2021.
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Why haven’t we found aliens? A physicist shares the most popular theories. | Brian Cox
12:47
Why haven’t we found aliens? A physicist shares the most popular theories. | Brian Cox
2.9M viewsSep 29, 2023
YouTubeBig Think
Alien Theory: Comet 3I/ATLAS Enters Solar System With Unusual Tail Shift | The Breakfast Club
30:49
Alien Theory: Comet 3I/ATLAS Enters Solar System With Unusual Tail Shift | The Breakfast Club
9.1K views5 months ago
YouTubeCNN-News18
Alien Theories You Have to See to Believe | Ancient Aliens | Marathon | History
2:12:17
Alien Theories You Have to See to Believe | Ancient Aliens | Marathon | History
416.3K views10 months ago
YouTubeHISTORY
The Hybrid Theory: Human or Alien? | Ancient Aliens | History
32:32
The Hybrid Theory: Human or Alien? | Ancient Aliens | History
919.3K views5 months ago
YouTubeHISTORY
Inside Look At Area 51 *New Theories Revealed!* | Ancient Aliens | History
34:00
Inside Look At Area 51 *New Theories Revealed!* | Ancient Aliens | History
9M views11 months ago
YouTubeHISTORY
The ancient alien theory sounded possible - until the missing evidence became impossible to ignore
31:07
The ancient alien theory sounded possible - until the missing evidence became impossible to ignore
3 weeks ago
MSNIsaac Arthur
Linda Moulton Howe's BIGGEST Theories Revealed | Ancient Aliens | History
23:20
Linda Moulton Howe's BIGGEST Theories Revealed | Ancient Aliens | History
311.3K views11 months ago
YouTubeHISTORY
40:56
Big Alien Theory
82.2K views1 month ago
YouTubeIsaac Arthur
3:29
Mystery Object Moving Unusually Towards Earth! | Comet or An Alien Probe? | WION
176.5K views8 months ago
YouTubeWION
50:46
Uncovering Alien Conspiracies | The Proof Is Out There | History
179.5K views11 months ago
YouTubeHISTORY
33:04
Outer Space’s Most Baffling Mysteries | Ancient Aliens | History
772.7K viewsMar 4, 2025
YouTubeHISTORY
1:18:48
PROOF* THAT ALIENS ARE REAL!!! (*my theory) with Neil deGrasse Tyson
326.1K views1 month ago
YouTubeHasan Minhaj
1:18:32
The NEW Complete Alien Timeline (1979 - 2025)
96.4K views4 months ago
YouTubeNerdist
20:43
Top 20 Alien Conspiracy Theories
93.5K viewsNov 14, 2024
YouTubeWatchMojo.com
59:11
Ancient Aliens: TOP UFO MYSTERIES OF 2025 | Part 1
354.2K views4 months ago
YouTubeHISTORY
2:05:33
Uncovering the Truth: Giants, Alien Relics & The Human Experiment *Marathon* | Ancient Aliens
454.5K views7 months ago
YouTubeHISTORY
4:34
The Pentagon’s Mysterious UFO Program (S21) | Ancient Aliens | History
38K views11 months ago
YouTubeHISTORY
8:38
Alien: Earth — Theories That Actually Fit the Timeline
49.1K views7 months ago
YouTubeScreenRant
42:15
The Global Threat (Full Episode) | UFOs: Investigating the Unknown
6.7M viewsFeb 24, 2024
YouTubeNational Geographic
1:06:43
Alien Origins | Aliens On Earth: The True Story Of Human's Origin | Full Sci-Fi Movie | Free Movie
4.1K views6 months ago
YouTubeV Movies
34:38
Groundbreaking Alien Connections of India | Ancient Aliens | History
877.1K viewsMar 25, 2025
YouTubeHISTORY
7:43
Lizard People Conspiracy Theory Explained
2.8M viewsDec 6, 2019
YouTubeBuzzFeed Unsolved Network
1:18:30
Brian Cox: Why black holes could hold the secret to time and space | Full Interview
3.8M views9 months ago
YouTubeBig Think
2:02
Alien: Romulus | Official Trailer
13.2M viewsJun 4, 2024
YouTube20th Century Studios
44:25
Experts Reveal What Really Happened (Full Episode) | Area 51: The CIA's Secret
9M viewsJun 23, 2024
YouTubeNational Geographic
1:03
Alien: Romulus | Teaser Trailer
22.2M viewsMar 20, 2024
YouTube20th Century Studios
18:31
Ancient Aliens: Inside Area 51's UFO Secrets | History
5.8M viewsMay 9, 2024
YouTubeHISTORY
Un Exobiologiste analyse les aliens dans les films (Prometheus, La Guerre des Mondes, Predator...)
15:29
Find in video from 07:53Alien
Un Exobiologiste analyse les aliens dans les films (Prometheus, La G…
396.7K viewsAug 21, 2024
YouTubeAlloCiné
53:05
Encounters with UFOs; Search for ancient life on Mars; James Webb Space Telescope | Full Episodes
3.7M viewsJul 29, 2023
YouTube60 Minutes
1:47
Investigation Alien | Official Trailer | Netflix
1.7M viewsOct 11, 2024
YouTubeNetflix
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