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 How Many Stars Are There? Red Supergiant Betelgeuse Could Explode Tomorrow!!?? NASA Wants to Make a Supersonic Jet With No Boom NASA’s Plan To Harpoon a Comet From Earth to Mars in 30 Days – New Engine Invented Stephen Hawking Says He’s Figured Out How To Sescape From a Black Hole