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All the latest on newscientist.com: tools to spot aliens, data trackers that nudge you, Twitter revelations, solving a big magnetic mystery and more
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All the latest on newscientist.com: tools to spot aliens, data trackers that nudge you, Twitter revelations, solving a big magnetic mystery and more
If particles of dark matter had never formed the clumps they are in today, they would scurry around space at no more than 54 metres per second