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L
unarexploration
Thereis now cast-iron evidence for wateron the Moon
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Previous scans of the Moon’s south pole in the 1990s, by nasa missions called
Clementine
and Lunar Prospector, had indicated large amounts of hydrogen were present in the region,though it was unclear what form this hydrogen took. lcross was designed to find out. The crash excavated 350 tonnes of lunar
regolith
, creating within Cabeus a crater 20 metres wide and generating a plume that rose 10km from the surface. Among the ejecta, lcross detected the characteristic three-
micron
spectroscopic signal, but still could not distinguish whether
the cause
was water or hydroxyl.
a kind of small, sweet orange
小甜橘
regolith
noun [mass noun] Geology
the layer of unconsolidated solid material covering the bedrock of a planet
浮土
mi
·
crom
·
e
·
tre
also mi·cronnoun CBrE; micrometer AmE
a unit for measuring length. There are one million micrometresin one metre.
微米〔百万分之一米〕
因果
;
因果关系
You use cause and effect to talk about the way in which one thing is caused by another.
...fundamental laws of biological cause and effect.
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