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 Can You Trust Your Eyes in Spacetime? ‘Alien’ Megastructure Found Around a Star claim Researchers Scientists figured out how to hide from aliens How NASA Used Teamwork to Reach Saturn 1,000km Cable to the Stars – The Skyhook Meet Curiosity Rover’s Brother, “Scarecrow”