Mars is a lot like Earth in many ways. The signs of water are obvious in the deep valleys. Many have speculated about once vast oceans often centered over the northern part of Mars. Where did the water go? Extensive radar mapping of the middle latitude region of northern Mars shows that thick masses of buried ice are quite common beneath protective coverings of rubble. NASA’s Mars Reconnaissance Orbiter has charted the locations of these hidden glaciers and ice filled valleys which were first confirmed by radar two years ago.