n.外层，外逸层(行星大气的最外层)

The satellite orbits within the exosphere of Earth.
卫星在地球的外大气层中运行。
The spacecraft penetrated deep into the exosphere before re-entering the atmosphere.
航天器深入外大气层后才重新进入大气层。
Meteors often burn up in the exosphere due to friction with the thin gas particles.
由于与稀薄气体粒子的摩擦，流星常常在外大气层中燃烧殆尽。
Scientists believe that comets originate from the outer edges of the solar system, beyond the exosphere.
科学家认为彗星起源于太阳系的边缘，即外大气层之外。
At night, one can sometimes see noctilucent clouds forming in the exosphere.
在夜晚，有时可以看到夜光云在外大气层形成。
The exosphere gradually merges with interstellar space as it extends outward.
随着向外延伸，外大气层逐渐融入星际空间。
Satellites need to maintain a specific altitude to avoid interference from the denser layers of the exosphere.
卫星需要保持特定的高度，以避免受到外大气层较密部分的干扰。
Some researchers propose using the exosphere for space-based solar power generation.
一些研究者建议利用外大气层进行太空太阳能发电。
The exosphere is so sparse that even light gases like helium and hydrogen can escape Earth's gravity.
外大气层如此稀薄，以至于氦和氢这样的轻气体也能逃离地球引力。
Studying the exosphere helps us understand the interaction between our planet and the surrounding interplanetary medium.
研究外大气层有助于我们了解地球与其周围行星际介质之间的相互作用。