Scientists already know that space travel exposes astronauts to cosmic ray radiation, which previous research suggests could increase the likelihood of developing aggressive tumors.

科学家已经知道，太空旅行会让宇航员暴露在宇宙射线的辐射中，而之前的研究证明，这会增加宇航员罹患恶性肿瘤的概率。

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His (as yet unpublished) research confirms, he says, that the variations in cloud cover seen by satellites match those in cosmic-ray flux better than anything else, such as the sun's total brightness.

ECONOMIST: Global warming: In flux | The