This is a picture which shows the Earth, its atmosphere (the clouds are likely in the troposphere and stratosphere), the limb of the Earth (the dark blue curve/edge which is the mesosphere and thermosphere), and the dark blue to black region of space (where our exosphere extends out to...).
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Image courtesy of NASA
The Exosphere
The last layer of the Earth's atmosphere is the exosphere. This is the area where atoms escape into space.
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