Check out these epic doomsday theories. See more in this Ancient Aliens compilation. Watch full episodes and stay up to date on all of your favorite shows on The HISTORY Channel website at #history #AncientAliens Find out more about the show and watch full episodes on our site: "Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years. Don't miss a video! Subscribe NOW: @HISTORY?sub_confirmation=1 Chapters: 00:00 Mayan Doomsday And 2012 Prophecy 02:26 Cyclical Time Versus Linear Time 06:19 Global Flood Myths Across Cultures 09:21 Indian Ocean Asteroid Impact Theory 14:00 Solar Flares Threatening Modern Technology 15:45 Building The Modern Doomsday Seed Vault 17:22 Future Asteroid Threats Are Inevitable 19:01 Humans As Products Of Alien Engineering ABOUT THE HISTORY CHANNEL: The HISTORY® Channel, a division of A+E Global Media, is the premier destination for historical storytelling. From best-in-class documentary events, to a signature slate of industry leading nonfiction series and premium fact-based scripted programming, The HISTORY® Channel serves as the most trustworthy source of informational entertainment in media. FOLLOW HISTORY CHANNEL: Watch Full Episodes: Sign Up For History Emails: Browse Topical Videos: Facebook: Instagram: TikTok: @history X: YouTube: @HISTORY Copyright Notice: This video and my YouTube channel contain dialog, music, and images that are property of The HISTORY® Channel. You are authorized to share the video link and channel, and embed this video in your website or others as long as a link back to our YouTube Channel is provided. © 2025 The HISTORY® Channel Is The End Closer Than We Thought? | Ancient Aliens | History @HISTORY/