Can i say that gravitational force will be attractive as long as our universe expands? In some times by pulsating theory, our universe contracts then gravitational force will be repulsive or it will be attractive always? Can it change?

Gravitational force is always attractive.
The pulsating theory says that at some moment, the expasion will be reversed by gravitational force and the universe will contracts to a singularity again. Then, a new big bang will happen and a new universe is created.
This should be an infinite loop, that's why "pulsating": forever expanding-contracting.

New evidences show that the expasion is accelerated, so this theory is not very popular right now, but very 'intuitive'.

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TopNewestGravitational force is always attractive. The pulsating theory says that at some moment, the expasion will be reversed by gravitational force and the universe will contracts to a singularity again. Then, a new big bang will happen and a new universe is created. This should be an infinite loop, that's why "pulsating": forever expanding-contracting.

New evidences show that the expasion is accelerated, so this theory is not very popular right now, but very 'intuitive'.

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