3 ms·
That unit system might allow comparing black holes to other black holes. But our sun does not have the same density as a black hole, or? The nature article [1]
by hamoid 12y ago
That unit system might allow comparing black holes to other black holes. But our sun does not have the same density as a black hole, or? The nature article [1] does not compare it to the size of our sun, but to its mass.
[1] http://www.nature.com/nature/journal/v518/n7540/full/nature14241.html http://www.nature.com/nature/journal/v518/n7540/full/nature1...
- Retric 12y agoActually, black holes density decreases linearly as their mass increases. So, there could easily be a black hole with a density of the sun with supper massive black holes having a density near that of water. (Where density = mass / volume inside event horizon). Because Gravity ~= Mass/distance ^ 2 but volume is 4/3 pi * r ^ 3
- semaphoreP 12y agoActually, you can use this unit system (called Geometrized units [1]) for anything, but it is especially convenient for describing black holes and general relativity in general. As a rule of thumb, in the geometrized units, 1 solar mass = ~1.5 km = ~5 microseconds. They have the same units so you can use them interchangeably (Our sun weights 5 microseconds). I'm just being pedantic here obviously.. [1] http://en.wikipedia.org/wiki/Geometrized_unit_system http://en.wikipedia.org/wiki/Geometrized_unit_system