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 Did NASA Try to Hide This Incredible Mars Object? Is There “SOMETHING” Moving On Mars? Space Elevator – Science Fiction or the Future of Mankind? Could We Hide The Earth? Expect More Spectacular Solar Flares Like This From The Sun This Year Ex-NASA Worker Claims She Saw Humans On Mars In 1979