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A mini version of ITER — the world’s biggest nuclear-fusion experiment — is gearing up to start pivotal fuel tests. The Joint European Torus (JET) in Britain is a sibling of the ITER project in France: it has the same doughnut-shaped ‘tokomak’ design as the French project, but one-tenth of its volume. In June, JET will try to fuse tritium and deuterium, the fuel mix that ITER will use. ITER aims to someday create more power from a fusion reaction than is put in — which has never before been demonstrated.
The hypothesis that there is a giant planet at the fringes of the Solar System has been dealt a blow by an analysis of distant, icy objects. The findings cast doubt on the evidence…
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