Gravity and mass in General Relativity

  • Thread starter Mekon
  • Start date
Hello all,
If there are two planets of identical size but very different mass, why does one have a higher gravity than the other given that space/time is curved by each in the same way? Or does space/time curvature depend not on the size of a body but its mass?
TIA
Mekon
 

George Jones

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Spacetime curvature caused by a massive body depends on the body's size, mass, and spin. Curvature depends on the distribution and movement of mass/energy.
 

HallsofIvy

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Hello all,
If there are two planets of identical size but very different mass, why does one have a higher gravity than the other given that space/time is curved by each in the same way? Or does space/time curvature depend not on the size of a body but its mass?
TIA
Mekon
Curvature depends upon "mass-energy". Where in the world did you get the idea that it depended on "size" (volume)?
 

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