A diamond will break if you hit it with a hammer.

Organist William Herschel discovered the planet Uranus in 1781 with the first reflecting telescope that he built. He named it Georgium Sidium in honour of King George III of England but in 1850 it was renamed Uranus in accordance with the tradition of naming planets for Roman gods.

Plates carrying the continents migrate over the earth’s surface a few centimetres (inches) per year, about the same speed that a fingernail grows.

The tail of the Great Comet of 1843 was 330 million km long. (It will return in 2356.)

During a total solar eclipse the temperature can drop by 6 degrees Celsius (about 20 degrees Fahrenheit).

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