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Caption: Replying to @raika.27 Not all water is the same. You’ve probably learned that water is H₂O — two hydrogen atoms and one oxygen atom. That’s true… but it’s not t… more Replying to @raika.27 Not all water is the same. You’ve probably learned that water is H₂O — two hydrogen atoms and one oxygen atom. That’s true… but it’s not the whole story. Because elements come in different “flavours” called isotopes — versions of the same element with different numbers of neutrons. So while all water is H₂O, the type of hydrogen and oxygen in that molecule can vary. And that gives water a slightly different chemical fingerprint. That’s how scientists trace where water came from. When they compared the fingerprint of water on comets to Earth’s oceans… it didn’t quite match. But water from certain asteroids — especially carbonaceous chondrites — is almost identical to Earth’s. Which means some of the water you drink today likely arrived here on asteroids billions of years ago. #Ast#Astronomya#SpaceFactst#Waterm#Cometsteroids less
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