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。
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.
太阳表面高速逸出的带电粒子形成了太阳风，它直达太阳系的边缘，使泡泡膨胀。
The bubble is inflated by solar wind, the high-speed stream of charged particles blowing out from the sun to the solar system's very edge.
这些带电粒子通过太阳风高速进入地球的高层大气中。
Electrically-charged particles are thrown towards the Earth and carried on the solar wind towards the upper part of our planet's atmosphere.
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