Definition

The outermost layer of the atmosphere surrounding the Earth or another planet, where the air is very thin and merges into space.

Example

The satellites orbit in the exosphere, far above the clouds and weather.

Conversation

Did you know that the exosphere is the outermost layer of Earth's atmosphere?

Yeah, I heard it's where satellites orbit!

Exactly! It's fascinating how thin that layer is compared to the rest.

I agree, it's amazing to think about what's up there.

Synonyms & Antonyms

Root Explanation

Exosphere → It is formed from "exo-" (meaning outside or external) and "sphaira" (from Greek, meaning sphere). The word "exosphere" refers to the outermost layer of the Earth's atmosphere, which is located outside the other atmospheric layers.

Memory Tip

Think of 'exo-' meaning 'outside' and 'sphaira' meaning 'sphere' to remember that the exosphere is the outer layer of the atmosphere.

Visually Confused Words