Week 6, clip 12

Timepoint:  5:52.5

1) Many galaxies have massive black holes in their center, which can contain more than 1e7 solar masses.  What would be the Schwarzschild radius ($$R_S$$) of such a black hole?  Give your answer in AU rounded to two significant digits.

Answers:
1) The accepted range is [0.18,0.22]

Explanation:
R_S = (2*G*M) / (c^2) = 2.95 km * (M / M_sun)

2.95 km * 1e7 = 2.95e7 km
2.95e7 km / 1.495978e8 km/AU = 0.20 AU