Abstract
Arguments showing that gas present in superclusters should have a characteristic temperature of approximately 10 6 K are presented. In the most popular models of large-scale structure formation, including hot and cold dark matter, peculiar velocities of matter relative to the background are 1000 km/s. This would imply temperatures exceeding 10 7 K. However, most of the peculiar motions can be attributed to large-scale, coherent velocities. Moreover, gas inside superclusters which is not concentrated in groups or clusters will cool adiabatically with the Hubble expansion. A temperature of 10 6 K implies that radiation from gas in superclusters should not be seen in X-rays of energy > 500 eV
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