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 Space Solar Power Systems (SSPS) Where 26 Asteroids Recently Hit Earth Since 2000 Weird activity in space could be aliens How Close Are We to Photographing a Black Hole? Is This a UFO Spaceship Docked at the ISS? Photosynthesis Unleashes Chemical Superweapon: Oxygen