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
Answered by: Simon Hooks, Physics A-Level Student, Gosport, UK
'The atomic bomb ... made the prospect of future war unendurable. It has led us up those last few steps to the mountain pass; and beyond there is different country.'