Created
July 7, 2012 23:56
-
-
Save berekuk/3068627 to your computer and use it in GitHub Desktop.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| mass(universe) = 3e52 kg # http://en.wikipedia.org/wiki/Observable_universe#Estimation_based_on_the_measured_stellar_density | |
| mass(sun) = 2e30 kg | |
| diameter(sun) = 1.3e6 km | |
| radius(sun) = 6e5 km | |
| orbit(earth) = 1.5e8 km | |
| density(neutron star) = 4e14 * density(sun) # http://en.wikipedia.org/wiki/Neutron_star | |
| mass(neutron star with the size of sun) = 2e30 * 4e14 = 8e44 | |
| mass(neutron star with the size of earth orbit) = (1.5e8 / 6e5)^3 * 8e44 = 1.2e52 | |
| orbit(mars) ~ 1.5 * orbit(earth) | |
| mass(neutron star with the size of mars orbit) = 1.2 * 10^52 * 1.5**3 = 4.2e52 > mass(universe) | |
| alternative direct method: | |
| [neutron star density, kg/m3] 6e17 * [volume of sphere with the radius of mars orbit, km3] 5e25 * [convert m3 to km3] 1e9 = 3e52 |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment