These are the letters of the atmosphere from closest to earth to furthest away. So the Exosphere it's the outermost.
Troposphere
Stratosphere
Mesosphere
Thermosphere
Exosphere
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The outermost layer of the atmosphere is called the exosphere. It is the least dense layer and transitions into space, containing very few molecules.
Thermosphere and the exosphere
The outermost layer of Earth's atmosphere is called the exosphere. It extends from the top of the thermosphere to space and contains few particles, making it very thin.
The outermost layer of the sun's atmosphere is called the corona. It is visible during a solar eclipse as a halo of light surrounding the sun. The corona is much hotter than the layers below it, reaching temperatures of millions of degrees Celsius.
Exosphere
The outermost layer of the Sun, if you mean the surface, is called the photosphere. If you mean in the atmosphere, it is called the chromosphere which can only be observed on the day of a solar eclipse. Beyond that there is a very tenuous layer called the corona. I think that's the "outermost layer".