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In Our Time · November 22, 2007 · 45m

Gravity

The physics of gravity from Newton to Einstein. The panel traces how our understanding of the most familiar force in nature evolved from Newton's mathematical description to Einstein's radical reconceptualization as the curvature of spacetime.

This summary was generated from show notes and public descriptions, not from a full transcript review. Details may contain inaccuracies.

Highlights

Newton didn't explain gravity — he described it mathematically while admitting he didn't understand it
Newton's Principia describes gravity's effects with extraordinary precision but never explains what gravity is or how it works across empty space. Newton called this problem 'so great an absurdity.'
Einstein's general relativity transformed gravity from a force into a property of spacetime itself
Einstein didn't just improve Newton's theory — he replaced the entire conceptual framework. Gravity is not a force between objects but the curvature of spacetime caused by mass.
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