Do we first determine the gravity or density of a celestial object?

[Dreksler]

TL;DR

What do we know first, the gravity of a celestial object or its density? And how do we get to know it?

Do we first find out as to what is the gravitational strength of a celestial object and then with that determine its density or do we first know what is its density and then conclude with that as to what is its gravity? Also whether the knowledge about gravitational strength or density comes first how do we get to determine that first property with which we can then later conclude about the other one?

 

[PeroK]

Summary:: What do we know first, the gravity of a celestial object or its density? And how do we get to know it?

Do we first find out as to what is the gravitational strength of a celestial object and then with that determine its density or do we first know what is its density and then conclude with that as to what is its gravity? Also whether the knowledge about gravitational strength or density comes first how do we get to determine that first property with which we can then later conclude about the other one?

This is the sort of thing you can research for yourself. E.g.

https://en.wikipedia.org/wiki/Solar_mass#History_of_measurement