What nationality was the man who determined that light has a finite speed?
Ole Rømer Ole Christensen Rømer (] ; 25 September 1644 – 19 September 1710) was a Danish astronomer who in 1676 made the first quantitative measurements of the speed of light.
Andrew Gray (physicist) Dr Andrew Gray {'1': ", '2': ", '3': 'FRS FRSE', '4': "} (2 July 1847 – 10 October 1925) was a Scottish physicist and mathematician.