&quot;Galileo, like Beeckman also suspected that the speed of light wasn&#x27;t infinite and made passing references to an experiment involving lanterns in some of his work.&quot;<p>That&#x27;s some good thinking in that time... any idea what could have made them suspect this back then? There were hardly even newtonean physics, and you can&#x27;t see with the naked eye that it&#x27;s a finite speed, so I&#x27;d love to know how they reasoned aobut it.