exosphere

n.外大气层

Last is the exosphere, which is the outermost layer of the atmosphere. 最后是散逸层，这是大气的最外层。

Above the troposphere is the stratosphere, followed by the ionosphere and capped by the exosphere. 在对流层上是平流层，接着是电离层，最上层是外逸层。

English: 87. Above the troposphere is the stratosphere, followed by the ionosphere and capped by the exosphere. 中文:在对流层上是平流层，接着是电离层，最上层是外逸层。

English: 87.Above the troposphere is the stratosphere, followed by the ionosphere and capped by the exosphere. 中文: 在对流层上是平流层，接着是电离层，最上层是外逸层。

The WFC3 images do not show any evidence for a temporary exosphere resulting from the impacts. 但是，WFC3的图像显示，没有因撞击而产生的任何临时外逸物质的迹象。