Umm, what, no indeed? Let me posite here. You are next to a large container floating in space, you ask me how much it weighs. I ask, what is the gravity at the surface of the mass it is resting on. You say, well there is no gravity, it's in space, and I say, therefore it's weight is zero. You ask, then how much does that 500 meter long space station weigh, same answer, zero, because there is no gravitational acceleration and fixed surface by which to calculate weight. Well then you ask, how much does that planet weigh? The same, due to the same constraints. You see a tonne of feathers on earth "weighs" one sixth of a tonne on the moon, so weight is entirely imaginary, it has no fixed value like mass. If you were to increase the number of feathers to make a tonne on the moon you will have increased the "mass" of the feathers, if you move it to earth it would now "weigh" 6 tonnes. So discussing weight in space is pointless, there is no weight, whereas mass remains constant and doesn't change no matter what the gravity.
As regards the arms, that's action/reaction, nothing to do with "weight" because the arm has none, weight only exists as a function of acceleration in a gravity field, your movement is to do with mass and momentum and one thing you can't do is move yourself forward doing that in zero gravity, because the forces balance out and provide no motion, the rest of your body would move forward according to the momentum and mass of the arm moving backward until they reached a point of balance, all you are achieving is moving the arms mass and your bodies mass closer to the center of mass and nothing else. The actual professor, not the pretend one, would be laughing like a hyena at around this point. To achieve movement you need to "eject" mass, so you could move by throwing an object because the object and your body then become two objects that have exchanged energy in the form of momentum, but anything that remains attached to your body, like your arm, will simply result in the forces balancing and no movement, as they, physics Sherlock!
I mean this comment of yours was a joke obviously, but I think the original poster was serious about weight, it's important if we are criticising a game for not having proper physics that we understand how physics actually works even if the makers of said game don't.
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