- #36
Nugatory
Mentor
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- 9,674
It is OK, however, to talk about the coordinate velocity of the planet using Schwarzschild coordinates, or to talk about the instantaneous speed of the planet relative to a colocated object that is hovering at constant ##r## as the infalling object passes it.PeroK said:You're right. It's better not to talk about the speed of the planet relative to the black hole at all.