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Free-Fall Frame Insight for Gravitation

Einstein recognised that an observer in sufficiently small free fall can describe local physics without an apparent gravitational force, an insight that became central to his equivalence principle.

Albert Einstein photographed in Princeton in 1947
Albert Einstein, Princeton, 1947. Photograph by Oren Jack Turner; Library of Congress image with no known restrictions. Wikimedia Commons source.
Read the explainer →Year 1907BernPhysics

Free-Fall Frame Insight for Gravitation

1907 · Bern · Switzerland · Physics

Einstein recognised that an observer in sufficiently small free fall can describe local physics without an apparent gravitational force, an insight that became central to his equivalence principle.