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 Tau Ceti Be Humanity’s Next Home? Solar Sails are the Future of Space Travel ISS Astronauts Just Ate the First Lettuce Grown in Space! Black Holes and Dark Matter NASA’s On Course To Take Pluto’s Best Photo Ever ESA’s Mission to De-Clutter Low-Earth Orbit Takes a Step Forward