That's the whole point of the exercise: to show that these frames of reference are all relative. And if you think about it, the exact point of origin of the 'big bang' might actually be a frame of reference relative to which gravity disappears globally.
Relativity is a very tricky concept.
Of course gravity is a 'real' force but the ability to shift your frame of reference is a powerful reminder that gravity and acceleration can look the same until you exit your frame of reference.
Relativity is a very tricky concept.
Of course gravity is a 'real' force but the ability to shift your frame of reference is a powerful reminder that gravity and acceleration can look the same until you exit your frame of reference.