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 Could We Hide The Earth? Astronomers Discover First Interstellar Object You Heard of Black Holes, What about White Holes? Did NASA Just Spot a Vacuum Cleaner Nozzle on Mars? Dream Chaser – America’s Next Space Shuttle What Life Is Like As An Astronaut