NASA's Chandra X-ray Observatory and the European Space Agency's XMM-Newton satellite spotted a spike of X-ray emission coming from more than 70 galaxy clusters. The X-rays could be generated by the decay of one type of dark-matter particle.
NASA's Chandra X-ray Observatory and the European Space Agency's XMM-Newton satellite spotted a spike of X-ray emission coming from more than 70 galaxy clusters. The X-rays could be generated by the decay of one type of dark-matter particle.
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