Drop a marble and a cannonball off the Leaning Tower of Pisa at the same time and they will hit the ground at the same time. That fact is explained by Albert Einstein’s theory of gravity — general relativity — which predicts that all objects fall in the same way, regardless of their mass or composition.
Einstein’s theory still passes the test: weak and strong gravity objects fall the same way
By Anne M. Archibald, Nina V. Gusinskaia, Jason W. T. Hessels, Adam T. Deller, David L. Kaplan, Duncan R. Lorimer, Ryan S. Lynch, Scott M. Ransom and Ingrid H. Stairs
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