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seen Dec 10 at 2:31

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answered At what velocity does sea water leave a pipe run into a fresh water lake (for equal surface levels)?
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answered Intuitive explanation of the inverse square power $\frac{1}{r^2}$ in Newton's law of gravity
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answered Rotation of Spacetime => Change in orbit/path
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comment What would a rotating black-hole look like to a “geo-stationary” observer orbiting the black hole
GRS 1915 has a mass of ~15 Msun, so with a near-maximal spin, the horizon has a radius of 15*1.5 km = 22.5 km, so the orbital velocity is actually "only" about 1/2 c.