7 thoughts on “Creative use of Nikon Gear

  1. *neid* It’s amazing camera and lenses still work under these conditions (launch acceleration, different atmospheric conditions, weightless, stellar radiation etc.)
    Question is, is this still pure Newtonian physics or are there already some relativistic effects (in the long run)? I only vaguely remember something from school about this.

  2. When I first see the small image I think how did Rolf get up there?
    Which I do not understand why it move only for short time in one direction. He does not get many farther away from earth in time so why will it not move in whatever direction the time before and after? I understand gravity is not gone until much farther away of earth. Do the ship rotate so it has nowhere to fall?

  3. I don’t see that there would be anything relativistic in this within the frame of reference defined by the space station. Of course, relative to the Earth there are effects as the space station is travelling fast relative to the Earth.

    To an observer on the Earth the on-board clocks will appear to be running fractionally slower when compared to clocks on the Earth, and of course to the astronauts the Earth clocks will appear to be running faster by a very small amount.

  4. There is nothing relativistic in here, just pure Newton. The ISS has some rocket engines at the back end and they fired them while the video was made. They have to do that from time to time to keep their height because the little bit of air that is still there slows them down.

    And then the same stuff happens as in a bus. The ISS increases its velocity, taking everything with it that is clamped down. The big Nikon wasn’t fixed to the ISS and stayed in the same position relative to the Earth. So the Nikon didn’t fly backwards, the ISS moved forward.

    Let your camera or a bag dangle on a strap in a bs or train. With every acceleration your camera will swing backwards, every braking will push it forward. At least it looks this way because your system of reference is the bus, not the Earth.

    Oh, BTW, on Earth don’t try this with your camera without holding the strap. There are 9.8m/s² acceleration missing on the ISS. 😉

  5. > There is nothing relativistic in here, just pure Newton.

    I read it up. There are relativistic effects, quite some actually. That’s why I wrote “in the long run”. The decrease of altitude is not only because of friction due to some rogue atoms but also due to peripheral reduction of the orbit due to speed of movement (relative to Earth’s surface) and position in the gravitational field. Together with length contraction it sums up to almost a meter per month, which is quite a lot. Compared to more than a kilometer per year from drag it seems minuscule but it’s still amazing it’s in the same dimension and not just some micrometer or so.

    > There are 9.8m/s² acceleration missing on the ISS.

    Don’t worry, they aren’t missing, they’re still there. A little bit less, but the difference is not that noticeable. Thinking about it, it’s pretty clear, the station is hovering ~350km above the surface which is not much compared to the Earth’s radius of more than 6000km. The only difference in comparison to someone on the ground is, the station is moving. So while it’s falling to the ground is just moves enough to avoid crashing into Earth, resulting in a circular trajectory, also called orbit. It if would stop moving it wouldn’t fall much slower than someone down here. It just takes lower due to the long way. True weightlessness, aka 0g/m², only exists at the equilibrium, the zone between Earth and Moon where both gravitational fields sum up to zero. However, inside the station, with the hatches closed, you couldn’t tell the difference between both situations by any means so Einsteins law dictates we have to treat them as equal.

  6. I never would have thought that the relativistic effect would be that strong. Whow!

    Of course you are right in the second point, I was sloppy. The 9.81m/s² are “missing” in the reference system ISS (not observable) and are “present” (clonk) in the bus.

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