为什么小质量损失在太空吗?

There are two concepts involved here, which are very often confused. One of them is weight, which is how heavy things feel, and the other is mass. Mass can be considered as being how hard it is to accelerate or stop things. It just happens that the bigger the mass, the heavier the weight, i.e. the amount they are attracted to the Earth; this is because weight is a product of the mass and the strength of gravity.In orbit, you take away the weight but the mass is still there. This means that if you try to start it moving, or stop it moving, it's very difficult. So if you were to throw a hammer at someone on the shuttle, although it's weightless it will still have mass and inertia, and so it will still hurt when it hits!