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Matter density estimates in the 1980s
Liddle (2015, p.67) writes: "From the crude estimates that a typical galaxy weighs about $10^{11}M\odot$ and that galaxies are typically about a megaparsec apart, we know that the Universe cannot ...
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In what paper did Einstein posit the cosmological constant?
Einstein's seminal papers On the Electrodynamics of Moving Bodies and Explanation of the perihelion movement of Mercury from general relativity were fundamental in the descriptions of Special and ...
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