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 The Milky Way as You’ve Never Seen It Before Is the Universe a Matrix? Is A NASA Lab About To Crack Interstellar Travel? How Does NASA Detect Atmospheres on Distant Worlds? Red Supergiant Betelgeuse Could Explode Tomorrow!!?? Solar Sails are the Future of Space Travel