Reply to post: Re: A Quickie

Three certainties in life: Death, taxes and the speed of light – wait no, maybe not that last one

Yet Another Anonymous coward Silver badge

Re: A Quickie

Changes in gravity travel at the speed of light.

Newton assumed that gravity travelled instantly (he didn't know light had a finite speed) which meant that same classical astronomy observations didn't add up.

When you assume that gravity travels at the speed of light it all works out. Which was the reason for trying to measure a speed of light and was done succesfully pretty much at the end of Newton's life.

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