PerspectivePlanetary Science

Fountains of Youth

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Science  30 Jun 2000:
Vol. 288, Issue 5475, pp. 2325
DOI: 10.1126/science.288.5475.2325

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The search for geologic features indicative of past or present water is central to Mars exploration programs. As Tanaka explains in his Perspective, such features have tended to be associated with very old (> 1 billion years) regions. However, a study by Malin and Edgett indicates that the youngest geologic features on Mars show signs of fluid discharge and runoff. If the results hold up, then some very unusual event must have occurred in the recent past on Mars.