Space Station 1 in the film 2001: A Space Odyssey. Its inhabitants live in simulated artificial gravity, but it is not the same as that experienced on Earth.
This is the phenomenon that Arthur C Clarke exploited in his film 2001: A Space Odyssey. In the film, Dr Heywood Floyd's shuttle docks at the axis of Space Station 1, a 275m (900ft) diameter, slowly rotating wheel. As he makes his way outward along one of the spoke- like corridors, his weight (which is a measure of the gravitational force acting on his body) gradually increases until finally, at the rim of the station, it is close to his weight on Earth.
Of course, it's not quite the same as gravity on Earth. If Floyd drops an object, it does not fall directly to the floor, but appears to be deflected in the opposite direction to the space station's rotation. This is known as the ‘Coriolis effect’. The Coriolis effect illustrates a subtle point that was recognised by Einstein: gravity is only truly indistinguishable from acceleration in very small volumes of space. This means that, although it is possible for us to simulate something like the Earth's gravity, we can never really do it perfectly.
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