The farther out astronomers peer into the universe, the longer it has taken the light they see to reach Earth.
天文学家越往宇宙的深处观察，他们所看到的光线到达地球所需的时间就越久。
When they reach the earth's magnetic field the energy is transferred into visual light around the earth's Polar Regions.
当它们到达地球磁场之后，能量便在地球极圈地带转化成可视的光线。
When they reach the earth's magnetic field the energy is transferred into visual light around the earth's Polar Regions.
当它们到达地球磁场之后，能量便在地球极圈地带转化成可视的光线。
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