大气中的二氧化碳和甲烷阻止热量向太空散发。

Carbon dioxide and methane in the atmosphere block the escape of heat into space.

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当彗星靠近太阳时，它的冰层融化，释放的气体和尘埃飘向太空。

As the comet nears the sun, its ice melts, releasing gas and dust that stream away into space.

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这个问题正变得越来越具有挑战性，因为我们正在向太空发射更多的物体来帮助人们使用他们的手机和电脑。

The problem is becoming more challenging because we're sending more objects into space to help people use their mobile phones and computer.

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Nowadays, if you go to outer space, you can check for yourself that if you throw something out, it just goes on forever without your intervention.

现如今,如果你去了外太空,你可以向外抛个物体试试,如果你不打断它,它就会一直运动下去

耶鲁公开课 - 基础物理课程节选