Eli5 How do we know that gravity and acceleration is two different thing?

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How do we know that gravity is not an accelerated expanding of space?

It seems to do almost same thing to interacting objects.

“it’s complicated” comment is not welcome.

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At first glance, you might be able to attribute the effects of gravity to some kind of acceleration through space. But that theory breaks down pretty quickly once you start considering stuff like other celestial bodies. If gravity is just us accelerating through space, then why does gravity also pull us towards other massive objects when we get close to them?

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