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What's the definition of a planet's atmosphere edge? Does it just keep on thinning out to a light year and beyond or is there a clear transition?
by swayvil 4y ago
What's the definition of a planet's atmosphere edge? Does it just keep on thinning out to a light year and beyond or is there a clear transition?
- ceejayoz 4y agoBit of both. https://climate.nasa.gov/news/2919/earths-atmosphere-a-multi-layered-cake/ https://climate.nasa.gov/news/2919/earths-atmosphere-a-multi... 99.99997 percent is below 100km, but the exosphere is considered to go as far as 10k, and maybe further: > A February 2019 study using data from the NASA/European Space Agency Solar and Heliospheric Observatory (SOHO) spacecraft suggests, however, that the farthest reaches of Earth’s atmosphere — a cloud of hydrogen atoms called the geocorona — may actually extend nearly 391,000 miles (629,300 kilometers) into space, far beyond the orbit of the Moon.