Thanks to Newton we have a general form of k as shown here. Thanks to Kepler's third law (and Newton's tweaking) we can weigh things in the universe! (As long as they're orbiting something!)

@evilscientistca (As long as they're being orbited by something!) surely?

Saturn orbits the Sun but finding its mass from that orbit via Newton and Kepler would be a tad challenging. Finding it from Titan's orbit, less so.

@edavies yes but the Sun’s mass can be determined from Saturn orbiting it.

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