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Making the most of weightlessness: No one knows why bonesweaken rapidly but crystals grow perfectly when there is very littlegravity. A surge of interest in the science of microgravity may providesomeanswers
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The junkyard in the sky: Space is full of rubbish. From tiny flecks of paint to the broken remains of old satellites and rockets, the debris orbiting the Earth could mean the end of spaceflight within decades
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