The heliosphere shields the solar system from 90 percent of energetic cosmic rays — high-speed charged particles that would otherwise bombard the planets and harm life.

日球层就像一个盾牌，挡住了90%高能宇宙射线。 宇宙射线由高速带电粒子组成，会轰击星球并伤害生物。

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In preparation for longer spaceflight, scientists have designed shields to deflect harmful energetic particles, and continue to study the ill-effect of weightlessness on astronauts.

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