Wednesday
July 30, 2014

Homework Help: Physics

Posted by Zac on Thursday, July 26, 2012 at 12:00pm.

The Hubble Space Telescope (HST) has recorded evidence of a black hole at the center of the M87
galaxy. Using Doppler data, it's been measured that matter is orbiting the center of this galaxy at an
orbital speed of 7.5x10
5
m/s, out at a radius of 5.7x10
17
m. Calculate the mass of the black hole at the
center of this orbit. If our Sun's mass is 2.0x10
30
kg, how many solar masses is this black hole? For
comparison, the suspected black hole at the center of our own Milky Way galaxy is estimated to be
around 4 million solar masses.

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