Solution: Astronomers using the Hubble Space Telescope
Chapter 18, Problem 81GP(choose chapter or problem)
Problem 81GP
Astronomers using the Hubble Space Telescope deduced the presence of an extremely massive core in the distant galaxy M87, so dense that it could be a black hole (from which no light escapes). They did this by measuring the speed of gas clouds orbiting the core to be 780 km/s at a distance of 60 light-years (= 5.7× 1017 m) from the core. Deduce the mass of the core, and compare it to the mass of our Sun.
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