1. According to Rømer’s observations of Jupiter and its moon Io, light travelled at 220,000 km per sec. The correct figure is 299,000 km per sec.
2. Rømer was the first to prove that light did not travel instantaneously.
3. By coincidence, November 21 was also the date in 1905 when Einstein first published the equation e=mc², linking energy, mass and the speed of light.
4. This was a significant date in the history of sound as well as light: Edison announced his invention of the phonograph on this day in 1877.
5. On average, light from the Sun takes eight minutes 20 seconds to reach Earth.
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6. Moonlight takes about 1.25 seconds to reach us.
7. Sunlight reaches about 80 metres deep in the ocean.
8. One light year is the distance light travels in a year. It is equal to about 5,865,696,000,000 miles.
9. The nearest star to Earth, apart from the Sun, is Proxima Centauri which is 4.24 light years away.
10. According to current theory, light did not exist until between 240,000 and 300,000 years after the Big Bang. Since Dark Matter probably existed already, you could say we had dark before light.