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This is such a cool fact (lemmy.world)

submitted 4 months ago* (last edited 4 months ago) by [email protected] to c/[email protected]

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[–] [email protected] 5 points 4 months ago (1 children)

I'd go with the mesosphere, because that's where meteors burn up. That's a little below the karman line and is defined by actual qualities, instead of an arbitrary number. Regardless, both exclude the ISS. :)

[–] [email protected] 0 points 4 months ago (1 children)

Are you an astrophysicist?

[–] [email protected] 1 points 4 months ago (1 children)

No, just your garden variety nerd.

[–] [email protected] 0 points 4 months ago (1 children)

I would go with what the professionals use.

[–] [email protected] 1 points 4 months ago (1 children)

But "the professionals" don't agree. Most notably, the US Air Force says you're an astronaut if you go above 80km (approx the start of the thermosphere), and NASA switched to that standard too. At 80-90km, you can sustain an elliptic orbit, and around 150km, you can sustain a circular orbit.

The 100km Karman line doesn't signify anything, it's just a nice multiple of 10 that's pretty close to more important points. It's not based on science, the original science by Karman was the highest theoretical height for an airplane, which was just over 80km, it's just a nice number close to actual science.

So no, I'm not just going to accept 100km "because science."

[–] [email protected] 0 points 4 months ago