How do you spot aliens without landing? 🔭👽 Neil deGrasse Tyson explains the ultimate cheat code: Oxygen. Because oxygen is highly reactive and unstable, it shouldn't just "hang around" in an atmosphere. If you see it, it means something alive is constantly pumping it out. It’s the universe’s "Open for Business" sign. 🌍✨ #NeilDeGrasseTyson #Astrobiology #SearchForLife #Oxygen #Exoplanets #Aliens #SpaceFacts #astronomy | Hidden Byte
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