Definition
- Singular
The outermost layer of Earth's atmosphere, extending into space, where it gradually fades into the vacuum.
外气层
The temperature within the exosphere varies depending on altitude.
外气层中的温度会随着高度而变化。
In the exosphere, gas particles are extremely sparse, and atoms and molecules can escape into space.
在外气层中，气体粒子极为稀薄，原子和分子可以逃逸到太空中。
Scientists use space telescopes to study the composition of the exosphere.
科学家使用太空望远镜来研究外气层的组成。