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 Alien Life Found Living In Earth’s Atmosphere Does Earth Have A Second Moon? NASA’s Gold Box Will Make Oxygen on Mars What Is This Sound Recorded Above Earth? How Are Black Holes Formed? Huge Cloaked Alien Ship Near Mercury – Or Is It Something Else ?