NASA has found evidence of ice on Mars. What does that mean?

Mars, a world once bubbling with water, is now 1,000 times drier than Earth’s driest desert. However, some ice is still slowly flowing on the Martian floor.
Mars, a world once bubbling with water, is now 1,000 times drier than Earth’s driest desert. However, some ice is still slowly flowing on the Martian floor.