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The number of protons in the Universe is estimated to be about 1079 or thereabouts. A very large number. The existence of electrons and neutrons does not alter this number very much. This was worked out in the 1930s by Arthur Eddington, from fundamental principles though recent ideas may have altered this number slightly, and the basis for it.

Recent work on effects abroad in the Universe are firming up to support the idea that there are a couple of other sources, yet to be identified with certainty, called Dark Matter, and Dark Energy.

Taking reasonable estimates for these, current numbers are that Ordinary Matter is about 4.6% of the material, Dark Matter another 23%, and Dark Energy about 72%. The Dark components are made of sub-atomic particles of which our present knowledge is very uncertain.

These outnumber Ordinary matter by some 20 to 1, but that only adds another 1 or so to the exponent of the Eddington Number of 1080.

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