The space particle environment is composed of galactic cosmic rays, solar flares and geomagnetically-trapped particles.

空间高能粒子环境由银河宇宙射线、太阳宇宙射线及地磁捕获粒子组成。

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Understanding more about the heliosphere and its ability to filter out galactic cosmic rays could be critical for assessing the safety of human space travel, Schwadron notes.

对日球层和它过滤宇宙射线的机制了解的越多，就越有助于评估人类星际航行安全性。

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Most of the exposure estimated in Thursday's paper would come from galactic cosmic rays.

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This isotope can be delivered to the Moon by galactic cosmic rays.

BBC: Apollo samples reveal Moon's origin

The spacecraft was similar to one that would carry humans, and scientists were interested in measuring galactic cosmic rays and solar energetic particles on the trip.

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