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Is ten minute for an observer in different dimension, with the same speed relatively, same for every observer?

Thank you kirovman, but...g=k/r, what does k and r represent? (Sorry, I am just a secondary school student)

How is gravity affected by the interaction of the particles?

Are mass and distance the only factor to affect gravity? When star become a black hole, the mass remain the same, but the gravity of the black hole is certainly stronger than star. Why?