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Editor's note: the features that emerge in this movie are very faint indeed and are only discernible near the end of the simulation. You'll need to look very closely to see them. That's why we haven't created a set of thumbnails corresponding to this movi e.
Here we view the evolution of the universe through the eyes of an X-ray telescope. At each point in space the amount of X-rays emitted is computed assuming simple thermal bremsstrahlung emission. We then sum up the X-ray intensity along lines of sight passing through the computational volume.
Because the ROSAT satellite is most sensitive only to gas in excess of one million degrees kelvin, no X-ray clusters are visible until a redshift of around two. Thereafter, the X-ray clusters appear as small spherical balls of light against the X-ray dark sky, just as they appear in the real universe.
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