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Question

Does gravity have a speed?
Asked by: Walter Haskins

Answer

If you mean 'does gravity have a speed of propagation?, then the most agreed upon answer is that its speed is c, the speed of light in vacuum, the fastest possible speed.

This can raise surprising thoughts, for example, if somehow the sun were to suddenly disappear, it would take the same amount of time for the light to stop reaching us as it would for our orbit to be destroyed! Intriguing, but to the best of our knowledge, true!
Answered by: Simon Hooks, Physics A-Level Student, Gosport, UK


Science Quote

'In a way science is a key to the gates of heaven, and the same key opens the gates of hell, and we do not have any instructions as to which is which gate. Shall we throw away the key and never have a way to enter the gates of heaven? Or shall we struggle with the problem of which is the best way to use the key?'

Richard Phillips Feynman
(1918-1988)


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