Caption: Cartoon of a Schwarzschild black hole (FK-545; ABS-195,222).
The formula and 3 fiducial-value formulae for the Schwarzschild radius are
R_sch = 2GM/c**2 = 2.9532 km (M/M_☉) ≅ 3 km (M/M_☉) = 0.019741 AU [M/(M_☉**6)] ≅ 0.02 AU [M/(M_☉*10**6)] = 19.741 AU [M/(M_☉**9)] ≅ 20 AU [M/(M_☉*10**9)] = 9.5741*10**(-5) pc [M/(M_☉*10**9)] ≅ 10**(-4) pc [M/(M_☉*10**9)] .Even largest supermassive black hole known only have masses up to only of order 10**10 M_☉, and so can only have Schwarzschild radii of order hundreds of astronomical units.
Credit/Permission: © David Jeffery,
2005 / Own work.
Image link: Itself.
Local file: local link: blackhole_schwarzschild.html.
File: Black hole file:
blackhole_schwarzschild.html.