Scientists Think Mars Once Had Water. So What Happened to It? Mars may have had a core similar to Earth’s. It’s possible that when it diminished, the planet’s water went with it. Facebook Prev Article Next Article Space Checkout these cool gadgets... Related Posts Something Is Buried On Mars Fly-through Video Takes You Over a Canyon on Mars Messaging Extraterrestrial Intelligence What Happens When You Cry In Space? Mars One Was a Scam a Finalist Announced The First Humans on Mars