Comment on The End of an Era

hemko@lemmy.dbzer0.com ⁨4⁩ ⁨weeks⁩ ago

• TheTechnician27@lemmy.world ⁨4⁩ ⁨weeks⁩ ago

  The limit of space is widely defined as 100 km, which no commercial plane even nearly crosses.

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  • hemko@lemmy.dbzer0.com ⁨4⁩ ⁨weeks⁩ ago

    Yeah that’s called Kármán line, but it’s just arbitrary line. ISS is still orbiting within Earth’s thermosphere

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    • lauha@lemmy.world ⁨4⁩ ⁨weeks⁩ ago

      Yes, definitions are arbitrary but that is the definition of space.

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      • hemko@lemmy.dbzer0.com ⁨4⁩ ⁨weeks⁩ ago

        One can be simultaneously on earth, and in space. In fact we all are

        But I’m just arguing that while orbiting earth and being within the Earth’s atmosphere, it’s pretty much still on Earth. Just like you’re still at home even if you’re at the on the yard or even just outside the gate picking up mail from the mailbox. Looking at it from distance, it really doesn’t make difference

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    • TheTechnician27@lemmy.world ⁨4⁩ ⁨weeks⁩ ago

      What does “ISS” stand for again? I forgot.

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      • Goodlucksil@lemmy.dbzer0.com ⁨4⁩ ⁨weeks⁩ ago

        Imperial Starship. Wait, wrong comm.

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      • TaTTe@lemmy.world ⁨4⁩ ⁨weeks⁩ ago

        Islamic State of Syria

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      • FundMECFS@piefed.zip ⁨4⁩ ⁨weeks⁩ ago

        International Space Station

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    • ilinamorato@lemmy.world ⁨4⁩ ⁨weeks⁩ ago

      The Karman Line’s lowest theoretical point is still substantially higher up than commercial airplanes and its highest is substantially lower than the ISS. Most nations agree on it as the boundary for the purposes of law and regulation. Commercial airplanes fly about half as high as the line, while spacecraft orbit at four times its altitude or more.

      It may be scientifically arbitrary, but it’s got a lot going for it as a rough approximation.

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    • chunes@lemmy.world ⁨4⁩ ⁨weeks⁩ ago

      My favorite fact is that earth’s atmosphere extends 95,000 miles / 150,000 km beyond the moon.

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      • hemko@lemmy.dbzer0.com ⁨4⁩ ⁨weeks⁩ ago

        I couldn’t find any source for that, but exosphere is considered to extend to 10,000km or 190,000km, from which the latter is about halfway to the moon.

        Anyways those numbers are pretty damn tiny even on a small solar system scale

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    • BuboScandiacus@mander.xyz ⁨4⁩ ⁨weeks⁩ ago

      Thank you for the accents

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      • rmuk@feddit.uk ⁨4⁩ ⁨weeks⁩ ago

        Hére, håvē ßòmê mõrë.

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  • Eheran@lemmy.world ⁨4⁩ ⁨weeks⁩ ago

    But a plane is not “on earth”?

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    • TheTechnician27@lemmy.world ⁨4⁩ ⁨weeks⁩ ago

      Extremely pedantically, sure. But under that level of pedantry, the whole metric falls apart anyway because there’s surely never or rarely been a point in human history where someone hasn’t jumped/fallen (let alone this having been measurable). What about “touching”; your feet are just repelling the ground via electromagnetism.

      It’s really obvious what the metric is, and trying to pedant-proof it isn’t worth bloating it into a mouthful. We can just recognize what it obviously means, say “oh, neat”, and move on with our day.

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      • Rolder@reddthat.com ⁨4⁩ ⁨weeks⁩ ago

        Does it really count as being “on earth” if you’re standing on a floor instead of having your feet directly touch the dirt?

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      • Tiresia@slrpnk.net ⁨4⁩ ⁨weeks⁩ ago

        The last time everybody was touching a solid object connected to the Earth by touching other solid objects is probably around 15,000 years ago, when humans crossed over into the Americas. Before then, it would probably occur regularly that nearly all humans are asleep and the handful that are awake happen to all be touching the ground.

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    • davidgro@lemmy.world ⁨4⁩ ⁨weeks⁩ ago

      I guess you could count the atmosphere as part of earth, then things over 100km are in little enough of the atmosphere that it’s not really ‘touching’ it the same way. (For example not generating significant lift)

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      • Eheran@lemmy.world ⁨3⁩ ⁨weeks⁩ ago

        You could also count earth’s gravitational field, then nobody ever left it.

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