Altitude
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Altitude is a distance measurement, usually in the vertical or "up" direction, between a reference datum and a point or object. The exact definition and reference datum varies according to the context
An airliner flying in the stratosphere where airliners typically cruise to reduce fuel consumption. The blue layer is the ozone layer, fading further to the mesosphere.
Stratosphere
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The stratosphere is the second-lowest layer of the atmosphere of Earth, located above the troposphere and below the mesosphere. Pronounced, the name originates from Ancient Greek στρωτός 'layer, strat
Afterglow of the troposphere (orange), the stratosphere (blue) and the mesosphere (dark), at which atmospheric entry of objects begins, as in this case of a spacecraft reentry that leaves contrails.
The ozone layer in the stratosphere blocks harmful UV radiation from reaching the surface of the Earth. A gamma-ray burst would deplete the ozone layer, allowing UV radiation through.
Lightning extending above the troposphere into the stratosphere as blue jet and reaching into the mesosphere as red sprite