Abstract
There is no “edge of space,” no sharp demarcation where the Earth's atmosphere ends and outer space begins. Instead, there is the fuzzy, progressively thinning exosphere, a region filled mostly by neutral hydrogen atoms that stretches from an altitude of 500 kilometers to hundreds of thousands of kilometers above the Earth's surface. So far, the outer detectable limit of the exosphere is around 15.5 Earth radii—roughly half the distance between the Earth and the Moon.
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