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ROSAT |
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Using the ROSAT X-ray satellite, astronomers found that the environment of the cluster hosting C153 was even more violent than expected. Because young stars emit intense X rays, they stand out prominently in the ROSAT survey. satellite ROSAT and spectra taken by the Japanese satellite ASCA indicate the existence of a few relatively distant galaxy clusters, but the data aren't good enough to determine whether the clusters are as massive and as hot as the ones that Evrard's team predicts. |
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