Synonyms and antonyms of the word "exosphere"

Antonyms:

Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.

And so, in that sense, I think it's much more like the exo in exosphere, rather than exoskeleton, as you suggest.

Source: https://www.opednews.com/articles/An-Interview-with-Robert-L-Devil_Evil_Interviews_Language-230305-709.html

Its exosphere is coated with a 16K LED display and lit up the sky.

Source: https://brobible.com/sports/article/the-sphere-las-vegas-grand-prix-f1/

The Sphere sat near turns 5, 6 and 7. Its 580,000-square foot exosphere is coated with a 16K LED display and lit up the sky.

Source: https://brobible.com/sports/article/the-sphere-las-vegas-f1-grand-prix-formula-1/