I How does gravity affect time on different planets?

AI Thread Summary
Gravitational time dilation is influenced by gravitational potential rather than just the strength of gravity. To determine time passage differences between planets, one must know both the mass and radius of the planet, not just the gravity value. For instance, while Earth has a gravitational acceleration of 9.8 m/s^2, a black hole with the same gravitational strength can have vastly different time dilation effects due to its mass and size. Therefore, one second on Earth cannot be directly compared to one second on a planet with 3,000 m/s^2 gravity without additional information. Understanding these factors is crucial for assessing how gravity affects time on different celestial bodies.
EasterEggs123
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If a planet has gravity that is 3,000 m/s^2 instead of 9.8 m/s^2, would time passage be significantly different, or what would one second on Earth be compared to one second on that planet?
 
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EasterEggs123 said:
If a planet has gravity that is 3,000 m/s^2 instead of 9.8 m/s^2, would time passage be significantly different, or what would one second on Earth be compared to one second on that planet?

Gravitational time dilation depends on the gravitational potential.
 
DrStupid said:
Gravitational time dilation depends on the gravitational potential.
But you can find the potential by knowing that it's 3000 m/s^2?
 
EasterEggs123 said:
But you can find the potential by knowing that it's 3000 m/s^2?

No.
 
You'd need to know the mass and radius of the planet. For example, The Earth has 1 G of gravity, but so does a galaxy-mass black hole with Schwarzschild radius of 1 light year. The potentials for those two cases are hugely different even though the field strength is about the same.
 
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