What did Rømer prove about light with his 1676 discovery?
It has mass
It can be reflected
It travels at a finite speed
It is affected by gravity
Answer
Rømer's 1676 discovery proved that light travels at a finite speed. He observed that the time between eclipses of Jupiter's moons varied depending on the distance between Earth and Jupiter. This indicated that light took time to travel the distance between the two planets. Rømer's discovery was the first experimental evidence that light does not travel instantaneously.
Stargazing Through Time: The Ole Rømer Astronomical Challenge
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