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		A silvery bubble rises through Earth's atmosphere.     A moonrise sequence from an earlier space station, Skylab. The Moon is at first almost unrecognisable but for its surface markings. Moonlight enters the atmosphere and then leaves again, a path length twice that in moonrises seen from Earth's surface. Differential refraction pushes the lower limb upwards to create the highly flattened shape. Look out for a moonrise (or sunrise) from a high flying aircraft, the distortion is almost as extreme. Images courtesy NASA.