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 AstroGro – Bringing Fresh Food to Space TED – Could we actually live on Mars? – String theory explains multiple dimensions of time Timelapse: A Journey to the End of Time Here’s How We Could Reach Mars In Just 30 Minutes Is There Life on Enceladus?