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L
unarexploration
Thereis now cast-iron evidence for wateron the Moon
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Despite the Moon being Earth’s closest and most studied
celestial
neighbour, the presence of water there was confirmed only recently, by a gradual accumulation of evidence. In 1999 a nasa craft called Cassini detected
hints
of the stuff as it flew past on its way to Saturn. The hints became stronger a decade later when Chandrayaan 1, an Indian probe, flew to the Moon. An American instrument on board, the Moon Mineralogy Mapper (m3),employed a
spectrometer
to examine sunlight reflected back from the lunar surface. m3 found that infrared light of a specific wavelength—three
microns
—was being absorbed by the surface. This is an absorption pattern shown by water,but also by hydroxyl.
ce
·
les
·
ti
·
al
adjective usually before noun
relating to the sky or heaven
天空的，天上的
;
天堂的
:
celestial bodies ( = the sun, moon, stars etc )
天体
a very small amount or sign of something
（细微的）迹象
;
少许，微量
:
•
'When?'he asked with a hint of impatience.
“什么时候？”他带着一丝不耐烦问道。
•
We shall have to turn back if there's the slightest hint of fog.
只要有一丁点起雾的迹象我们就得往回走。
a piece of equipment for measuring the wavelengths of spectra
mi
·
crom
·
e
·
tre
also mi·cronnoun CBrE; micrometer AmE
a unit for measuring length. There are one million micrometres in one metre.
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