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# How do you measure the mass of a spacecraft in space?

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You could measure the gravitation. It hast towards earth and based on the know mass of earth and the distance you can then calculate the mass of the craft

I think
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@leon3103 I guess the real question is how you measure mass without the assistance of gravity. Probably there is somebody smart already got the answer... LoL
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I think you need the density and the size.
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When the craft is standing still in space and there is no other object in space u have to measure the gravity of the craft. There is no mass that hast no gravity
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@LastDigitOfPi density and size is very complicated with a spacecraft :D
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Mass equals force divided by acceleration. Relatively easy to determine those. You could also determine it through inertia if you're feeling fancy.
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@leon3103 there is no object without gravity. Everything except maybe light and stuff has its own gravity.

Why shouldn't an object that is not "pulled" by gravity have no mass?
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@LastDigitOfPi an object that isn't influenced by gravity has no weight but it still has mass. Mass is directly proportional with inertia. Weight = mass x gravitational acceleration. Thought I'd point that out so no one is confused
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@fuck2code that's what I meant