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 Earth’s Gravity to Slingshot Jupiter-Bound Juno Spacecraft How Many Arms Does Our Galaxy Have? Heavy Metal Cataclysm Did Earth Have Two Moons? Something Is Buried On Mars Concept Video Showcasing The Future Of Mars Habitation