Water reserves found on the moon are the result of asteroids acting as ‘delivery vehicles’ and not of falling comets as was previously thought. Using computer simulation, scientists have discovered that a large asteroid can deliver more water to the lunar surface than the cumulative fall of comets over a billion year period.
At the beginning of the space age, during the days of the Apollo program, scientists believed the moon to be completely dry. At these earliest stages in satellite evolution, the absence of an atmosphere and the influence of solar radiation were thought enough to evaporate all volatile substances into space...
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