About the same time, though, scientists realized comets might contain decaying radioactive isotopes that could have warmed cometary interiors to temperatures that caused the interiors to evolve.

然而，大约在同一时间，科学家们意识到彗星可能含有衰变的放射性同位素，这些同位素可能使彗星内部的温度升高到导致内部进化的温度。

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Moon rocks show that lunar water has more heavy hydrogen than does terrestrial water, indicating a cometary origin.

研究表明，月球岩石中的水资源比地球水资源包含更多的重氢元素，意即月球水有可能来源于彗星。

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Moon rocks show that lunar water has more heavy hydrogen than does terrestrial water, indicating a cometary origin. Christopher Intagliata reports The Apollo moon missions ended almost 40 years ago.

研究表明，月球岩石中的水资源比地球水资源包含更多的重氢元素，意即月球水有可能来源于彗星。

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As the cometary "grit" from Swift-Tuttle strikes our atmosphere, it burns up, often creating streaks of light across the sky.

BBC: Perseid meteor show reaches peak

They were all blasted off the Red Planet by some asteroid or cometary impact, and then spent millions of years travelling through space before falling to Earth.

BBC: Mars meteorite 'Black Beauty' is in a class of its own

There might be even more: the measurements probe only the top half-metre of regolith, but it is thought that cometary bombardment could have left ice in the top two metres.

ECONOMIST: At least lunar gold-diggers will be able to take a shower