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In search of Einstein's theory of relativity
100 years ago, Albert Einstein published his theory of relativity, and people have been trying to prove it ever since, including the Lisa Pathfinder rocket which has just taken off from French Guiana. Although of course it's not quite so simple...Our science correspondent Jonathan Amos tries to make it clearer.
(Photo: European Space Agency Launches LISA Pathfinder)
(Credit: ESA via Getty Images)
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