File:Einstein blackboard.jpg

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DescriptionEinstein blackboard.jpg	English: A blackboard used by Albert Einstein in a 1931 lecture in Oxford. The last three lines give numerical values for the density (ρ), radius (P), and age of the universe. The blackboard is on permanent display in the Museum of the History of Science, Oxford The formulae are: D = 1/c 1/l dl/dt = 1/c 1/P dP/dt D^2 = 1/P^2 (P0-P)/P ~ 1/P^2 (1a) D^2 = k rho/3 (P0-P)/P ~ k rho (2) D^2 ~ 10^-53 rho ~ 10^-26 P ~ 10^8 L.I. [or y.? then L.y. = light-year.] A ~ 10^10 (10^11) I [or y.? = year => an estimate for the age of the universe.]
Date	18 April 2010
Source	Own work
Author	`decltype`

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	15:12, 4 March 2021		3,648 × 2,736 (846 KB)	Belbury (talk \| contribs)	fix white balance
	21:02, 18 April 2010		3,648 × 2,736 (1.33 MB)	Decltype (talk \| contribs)	{{Information \|Description={{en\|1=A blackboard used by Albert Einstein in a 1931 lecture in Oxford. The last three lines give numerical values for the density (ρ), radius (P), and age of the universe. The blackboard is on permanent display in t

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