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Summary
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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.] |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 15:12, 4 March 2021 | | 3,648 × 2,736 (846 KB) | Belbury | fix white balance |
| 21:02, 18 April 2010 |  | 3,648 × 2,736 (1.33 MB) | Decltype | {{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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