• QuarterSwede@lemmy.world
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    21 hours ago

    PAGEOS had a diameter of exactly 100 feet (30.48 m), consisted of a 0.5 mils (12.7 μm) thick mylar plastic film coated with vapour deposited aluminum enclosing a volume of about 524,000 cubic feet (14,800 m3)[8][9] The metal coating both reflected sunlight and protected the satellite from damaging ultraviolet waves. The satellite was launched in a canister, which explosively separated as it was ejected from the rocket. Then, the balloon was inflated through a combination of residual internal air and a mixture of benzoic acid and anthraquinone placed inside, which turned to gas when the satellite was exposed to the heat of the sun.[9] It was the first satellite specifically launched for use in geodetic surveying,[3] or measuring the shape of the earth, by serving as a reflective and photographic tracking target. At the time, it improved on terrestrial triangulations of the globe by about an order of magnitude.[4] The satellite, which carried no instrumentation, broke up between 1975 and 1976.

    Wikipedia

    This was super interesting to read about. I thought the picture surely had to be CG or AI created at first.

    • Lovable Sidekick@lemmy.world
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      14 hours ago

      Remember this experience when someone “knows” something is AI because It’s “obvious”, and don’t call me Shirley!

    • thisbenzingring@lemmy.sdf.org
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      18 hours ago

      Over five years, 16 groups conducted observations at 45 globally distributed stations, about 3000-4000 km apart from each other.[4][7][12] 12 mobile tracking stations were used, which observed during favorable weather conditions during a few minutes of twilight each evening.[7][why?][clarification needed] BC4 cameras were used to photograph the satellite.[12] Observations were taken when the satellite was visible simultaneously to multiple stations at the same time.[12] This resulted in the fixing of the precise locations of 38 different points around the world.[4] This could be used to help determine the precise locations of the continents relative to each other, and to help determine the precise shape and size of the earth.

      that is amazing! so cool

      • XeroxCool@lemmy.world
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        17 hours ago

        And it sounds like it was usable for 9 years. That’s impressive for a very thin balloon surrounded by 50,000mph dust particles

  • Shardikprime@lemmy.world
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    17 hours ago

    “Have you tried everything?”

    “Everything, sir, it’s completely impregnable.”

    “We must get inside. For all we know, something may be living or perhaps even dying inside this”

    “It appears to be seamless–no way in, no way out.”

    • Obinice@lemmy.world
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      17 hours ago

      You know its reflective surface? Well, uh…

      I hate to be the one non-scientist that picks this up, guys…

      …What worries me is that it’s reflecting everything but us.

      • lurch (he/him)@sh.itjust.works
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        15 hours ago

        i noticed that in the OP too and it confused me a bit. then i noticed the dark corner bottom left, which is probably a bit of the wall of the dark room the picture was taken out of. that’s why the photographer isn’t in the reflection.

        • Natanael@infosec.pub
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          15 hours ago

          Just look at the center of the sphere. You see distant scaffolding and walkways. The camera could be a small one set up there.

      • addie@feddit.uk
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        18 hours ago

        I really like the book - I think it’s one of his best. Subtle ‘unreliable narrator’ mind-fuck from beginning to end, nicely written and characterised. The film of it is an abomination, though.

        • BackgrndNoize@lemmy.world
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          11 hours ago

          I’ve not read the book yet but I’ve seen the movie and it’s enjoyable by itself, maybe not a great adaptation, but still it was not terrible

  • Thorry84@feddit.nl
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    21 hours ago

    For those wondering: it was inflatable. So it didn’t weigh very much and wasn’t very big at launch. It then inflated to this huge size shown here.

    • rumba@lemmy.zip
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      4 hours ago

      The center line of lights in the reflection is higher than the location on the wall, which leads me to believe that the photographer is just above vertical center. You’re the nature of photographing a sphere horizontally they would have to be exactly centered.

      I think there’s somewhere around here

    • Redfox8@mander.xyz
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      14 hours ago

      If my understanding of physics is correct, they’d have to be slap bang in the centre of the reflected image (assuming a perfect sphere), so somewhere on the framework of the corner of the building.

    • Buddahriffic@lemmy.world
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      15 hours ago

      I think standing near the red things in the middle of the reflection. Look at the size of the forklift in the reflection for reference.

    • lurch (he/him)@sh.itjust.works
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      15 hours ago

      i noticed that in the OP too and it confused me a bit. then i noticed the dark corner bottom left, which is probably a bit of the wall of the dark room the picture was taken out of. that’s why the photographer isn’t in the reflection.

  • Gork@sopuli.xyz
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    22 hours ago

    This looks like such a non-human design that I would have mistaken it for a UFO if I found it in space.