Friday, March 5, 2021


 Around 1676, Danish astronomer Ole Roemer became the first person to prove that light travels at a finite speed. He studied Jupiter’s moons and noted that their eclipses took place sooner than predicted when Earth was nearer to Jupiter and happened later when Earth was farther away from Jupiter. Roemer reasoned this was the result of light moving at a finite speed; it took longer to make it to Earth when Jupiter was a greater distance away. 

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