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It was Galileo who first discovered that in a vacuum, if you were to drop two objects from the same height, they'd hit the ground at exactly the same time, regardless of their respective mass. In the atmosphere of Earth, we rarely - if ever - get to see this phenomenon. That's where this big vacuum chamber comes in.
British physicist Brian Cox wanted to see this phenomenon play out in a vacuum, where there is zero air resistance to affect the acceleration of Earth's gravity.
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