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Answer for the clue "The atmospheric layer between the mesosphere and the exosphere ", 12 letters:
thermosphere

Word definitions for thermosphere in dictionaries

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1924, from thermo- + sphere .

Wikipedia Word definitions in Wikipedia
The thermosphere is the layer of the Earth's atmosphere directly above the mesosphere and directly below the exosphere . Within this layer of the atmosphere, ultraviolet radiation causes photoionization /photodissociation of molecules, creating ions in ...

Wiktionary Word definitions in Wiktionary
n. The layer of the Earth's atmosphere directly above the mesosphere and directly below the exosphere.

WordNet Word definitions in WordNet
n. the atmospheric layer between the mesosphere and the exosphere

Usage examples of thermosphere.

The fall through the middle thermosphere felt like the Dragon was driving at top speed on a coarsely graveled road, the gravel getting coarser the farther down they went.

The solaser was supposed to graze the ice ring and the thermosphere of the planet.

The fall through the middle thermosphere felt like the Dragon was driving at top speed on a coarsely graveled road, the gravel getting coarser the farther they went.

But at the height of the thermosphere, at fifty miles or more, the air is so thin that any two molecules will be miles apart and hardly ever come in contact.

Conversely, if an incoming vehicle hit the thermosphere at too shallow an angle, it could well bounce back into space, like a pebble skipped across water.

Fast-moving specks were rising above the hazy blue-white horizon, skimming over the atomic fog of the thermosphere like flat stones flung across a placid sea.

The thin but boiling thermosphere of the planet added an occasional pocket of turbulence.

She looked up as the battleship streaked toward the thermosphere at full speed.

But at the height of the thermosphere, at fifty miles or more, the air is so thin that any two molecules will be miles apart and hardly ever come in contact.