Universe May Be Lighter Than Believed

The Universe’s mass could be only eighty per cent of what has been believed.

The Universe contains X-rays that originate from galaxy clusters. Previously, it was thought that these X-rays come from atoms that exist in vast regions of warm gas. However, scientists at the University of Alabama in Huntsville say that the X-rays could come from collisions between photons and electrons from the big bang. These photons and electrons would have much less mass than atoms.

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