其次，极地的大气层很薄，所以加热它所需要的能量很少。
Second, the polar atmosphere is thin, so little energy is required to warm it.
就像除了太阳之外，还有什么其它的东西在给大气层加热一样。
It's like something else is heating the atmosphere besides the sun.
在众多的巨大工程里面，或许还包括加热行星表面，为大气层输氧，创造水源等等艰巨任务。
It may require warming a planet's surface, introducing oxygen to its atmosphere and creating a water supply, among other massive undertakings.
这个磁场加热了太阳的大气层并且带走了由带电粒子（charged particle）组成的强大太阳风的质量（mass）和角动量（angularmomentum）。
This quick rotation powered a strong magnetic field, which heated the sun’s atmosphere and carried away mass and angular momentum in a strong solar wind of charged particles.
当太阳活动剧烈时，太阳极端的紫外线会加热并使热大气层扩张。
When solar activity is high, solar extreme ultraviolet rays warm and expand the thermosphere.
当太阳活动剧烈时，太阳极端的紫外线会加热并使热大气层扩张。
When solar activity is high, solar extreme ultraviolet rays warm and expand the thermosphere.
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