Abstract
The title of the paper indicates that our understanding of cluster X-ray sources has progressed considerably since their discovery in 1971. We now believe that the extended X -ray emission that is observed is due to the presence of high temperature ( T ≈ 10 8 K) gas in the clusters. The paper includes a review of the present status of cluster X-ray observations and an account of the evidence that points to brems-strahlung from hot plasm a as the X-ray emission mechanism. Current ideas about the origin of the intracluster plasma and its heating mechanism are examined and the possible role of cluster X-ray studies in furthering out understanding of the evolution of the Universe is discussed.
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