Throughout history, what we could see of the night sky was considered the totality of the universe. But it is only a small slice of that totality. In The Invisible Sky, we see much that was once not accessible to human eyes: we see the universe by the light of x-rays. Suddenly, unimagined new views become possible: 120,000 new x-ray sources, galactic collisions, extremely compact pulsars, quasars a thousand times brighter than the brightest galaxies. This spectacular book, by the scientists who developed and operate the ROSAT observatory, is the first to tell this extraordinary instrument's story for a lay audience.
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