The Shape of Gravity: Why On Earth Are Planets Spherical?

The Shape of Gravity: Why On Earth Are Planets Spherical?

This lecture explores the profound mathematical theories on the shape of planets, that deepen our understanding of the universe.

By Gresham College

Date and time

Location

Gresham College

Barnard's Inn Hall Holborn London EC1N 2HH United Kingdom

About this event

We often take for granted that planets, shaped by the force of gravity, are spherical. However, a closer look reveals that the Earth is not a perfect sphere—it is slightly squashed. But is it squashed like a pumpkin or more like a peanut? And is the sphere truly the only possible shape for a planet? As planets grow larger and must sustain increasingly extreme forces, can we still assume they maintain a spherical shape? These seemingly simple questions have fascinated scientists and mathematicians since the time of Newton, giving rise to profound mathematical theories that deepen our understanding of the universe.

A lecture by Professor Alain Goriely.

This event is also available to watch live online. To register, visit: https://www.gresham.ac.uk/whats-on/shape-gravity

Gresham College has offered free public lectures for over 400 years, thanks to the generosity of our supporters. We believe that everyone should have the opportunity to learn from some of the greatest minds. To support Gresham College's mission, please consider making a donation: Donate Today | Gresham College

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On Sale Jan 31, 2026 at 8:00 AM