Was Galileo Wrong?: Using lasers to ping the Moon, NASA-supported researchers are testing a fundamental assumption of modern physics.

Science.nasa.gov
Oct. 27, 2005

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May 6, 2004: Four hundred years ago--or so the story goes--Galileo Galilei started dropping things off the Leaning Tower of Pisa: Cannon balls, musket balls, gold, silver and wood. He might have expected the heavier objects to fall faster. Not so. They all hit the ground at the same time, and so he made a big discovery: gravity accelerates all objects at the same rate, regardless of their mass or composition.













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