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

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SUMMARY

The discussion centers on the relationship between the gravitational strength and density of celestial objects. It establishes that gravitational strength can be determined through measurements of mass and distance, while density is derived from mass and volume. The consensus is that gravitational strength is often assessed first, which then allows for the calculation of density using the formula density = mass/volume. Understanding these properties is crucial for astrophysics and celestial mechanics.

PREREQUISITES
  • Basic understanding of gravitational force and Newton's law of universal gravitation
  • Familiarity with the concept of density and its calculation
  • Knowledge of celestial mechanics and astrophysics principles
  • Experience with astronomical measurement techniques
NEXT STEPS
  • Research the methods for measuring gravitational strength in celestial bodies
  • Explore the calculation of density in astrophysical contexts
  • Learn about the role of mass and volume in determining celestial object properties
  • Investigate the historical methods of measuring solar mass and their implications
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Astronomers, astrophysicists, students of physics, and anyone interested in understanding the fundamental properties of celestial objects.

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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?
 
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Dreksler said:
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
 
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