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 Old-looking galaxy in a young universe: Astronomers find dust in the early universe How Do You Get To Mars In Half The Time? Could Tau Ceti Be Humanity’s Next Home? Black Hole Comparison Is Jaw-dropping NASA Scientist Debunks Mayan Doomsday Prophecies 5 Space Mysteries We May Solve in Our Lifetime