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Home News On this day in history, astronomer (accidentally) discovered speed of light

On this day in history, astronomer (accidentally) discovered speed of light

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Summary (IA Generated)

Before Rømer figured it out, scientists thought that light travels instantaneously, or infinitely fast.

Rømer disproved this almost by accident when he was studying Jupiter‘s moon Io.

When Earth was closest to Jupiter, the eclipses happened 11 minutes early.

Likewise, when the two planets were farthest away, the eclipses were 11 minutes behind schedule.


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