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In a book by Alexander Moszkowski, there is an Einstein quote about a hypothetical size of the universe (100 million Light years). Moszkowski claims that Einstein had deduced that from the gravitational constant and the mass distribution of the Milky Way, as known around 1920. My question:

What was the data and the best estimate of the mass density of the Milky Way, back then in 1920?

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  • $\begingroup$ Was this model Einstein's radius of the universe (see also here)? If so, we can work backwards from the result to find the density. $\endgroup$ – HDE 226868 Jun 20 '15 at 18:50
  • $\begingroup$ Of course, but I'd like to have an independent source. Btw, do you know Einstein's original publication of the Einstein radius? $\endgroup$ – ClassicalPhysicist Jun 20 '15 at 18:57
  • $\begingroup$ This paper goes over a finding of part of a manuscript of Einstein's that first set out the idea, but I don't know where the published version of the manuscript can be found. $\endgroup$ – HDE 226868 Jun 20 '15 at 18:58

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