Where does Earth end and outer space begins?

When climbers climb Mount Everest, they regularly carry oxygen cylinders, devices that allow them to breathe freely at high altitudes. This is necessary because the closer you get to the edge of Earth’s atmosphere, the less oxygen there will be available compared to the abundant oxygen found on the ocean floor.

This is just one example of how variable Earth’s atmosphere is and reflects the elemental makeup of its layers, from the troposphere, near the ocean floor, to the exosphere, in its outermost regions. Where each layer ends and begins is defined by four major characteristics National Weather Service (opens in new tab)Temperature change, chemical composition, density and movement of gases within it.

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