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unarexploration
Thereis now cast-iron evidence for wateron the Moon
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Extracting water from such beads would not be straightforward. A more promising source is the ice thought to exist in cold traps. Dr Hayne’steam used
high-resolution
images from nasa’s Lunar Reconnaissance Orbiter to identify potential cold traps all across the Moon’s surface. There are more than had been hoped for, and they range in size from several kilometres to a few centimetres
across
. Most, as expected, are found near the poles, where the sun,when visible, remains near the horizon and shadows are consequently long. But asmall number also exist at lower latitudes, created by craters or other surface variations that might be small but nevertheless maintain shadows where the temperatures stay low enough to accumulate ice.
high-resolution
adjective
(of a photograph or an image on a computer or television screen)showing a lot of clear sharp detail
高清的
used to show how wide something is
宽
:
10 feet / five metres etc
across
•
Theriver is 2 km across.
这条河宽两公里。
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