does gravity depends on mass
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: What makes us so sure that gravitation depends on mass?
Certain observations point us towards the conclusion that gravitation and mass have to be connected, somehow.
The fact that all planets revolve around the sun, and not any other planet? What is common in all these movements? Why is it that so many celestial objects revolve around one object, which also seems to be more massive than all other objects? I think the answer is pretty straightforward: the object in question has the greatest amount of mass when compared to all other objects in the system.
Newton, while he was studying gravity, asked a subtle question back in the day. He argued, “if the apple fell towards the Earth, does the moon, too?” Basically, what his argument implies is if earth pulls everything to itself, then we should see the moon falling towards the Earth as well, but that's not true
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