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 The Star That Trolled Astronomers Finally A Solution For Space Junk – CleanSpace One Satellite This Is How The Universe Began NASA Discovers The Most Earth-like Planet Yet The Strange Case of the Himiko Blob Black Holes and Dark Matter