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Published online by Cambridge University Press: 25 May 2016
AXAF has been a long time, 20 years, in coming. This has made AXAF so overfamiliar that it is hard to see how revolutionary it still is. Some even describe AXAF as the end of the line in X-ray technology; a never to be repeated venture to high resolution. This view is wrong. To see why we need to see where X-ray astrophysics is going.