Getting to just beneath the cosmic speed limit would require six whole years at full power.
达到宇宙速度极限要全力行驶6年。
Einstein's theory of special relativity sets of the speed of light, 186,000 miles per second (300 million meters per second), as a cosmic speed limit.
爱因斯坦的狭义相对论把光速定位在每秒186,000英里（每秒300,000米），并把它作为宇宙的速度限制。
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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