Robots will venture into the sunless depths of lunar craters to find ancient water ice, while studies find hints about how water arrives on rocky worlds.
slightly as temperatures on the moon fluctuate. “These are very dynamic cold regions,” Ahrens said in an interview. “They are not stagnant.”
, or “shadows within shadows,” said Patrick O’Brien, a graduate student at the University of Arizona, who presented evidence for the idea in Houston. While PSRs don’t experience direct sunlight, most receive some reflected light bouncing off the crater’s rim, and this can melt ice. Double-shadowed regions are secondary craters inside PSRs that don’t get reflected light. “Temperatures can be even colder than the permanent shadows,” said O’Brien; they reach as low as minus 250 degrees Celsius.
If the moon’s ice was delivered exclusively by comets, the same might have been true for Earth. That could mean rocky worlds must experience such impacts to accumulate the water necessary for life to flourish. However, Landis says it’s too early to say whether Mandt’s research holds true for all ice on the moon. “The community needs more time to digest it,” she said.
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