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 You’ll Doubt We’re Alone In The Universe After Reading This How NASA Will Capture An Asteroid Something Is Entering Earth’s Atmosphere! Extremely Large Telescope Could Spot Alien Life This Is How NASA’s Asteroid Redirect Mission Would Work Is this a UFO crash site on Mars?