• hemko@lemmy.dbzer0.com
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    1 day ago

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

    • ilinamorato@lemmy.world
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      15 hours 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.

    • lauha@lemmy.world
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      1 day ago

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

    • chunes@lemmy.world
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      1 day ago

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

      • hemko@lemmy.dbzer0.com
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        1 day 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

        Anyways, even if you look from very close, from our own moon to the earth, anything on the low earth orbit is so extremely close to the planet. Just look at some of the famous earthrise photos, and think of something orbiting ~8% of the radius distance