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On this day in 1904 - December 20th - The Mount Wilson Solar Observatory was founded.

About fifteen years later, "solar" was dropped from the name as the 100-inch Hooker telescope came into use. Observing with it, Edwin Hubble found evidence that the Milky Way was just one galaxy in an expanding Universe.

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On this day in 1986 - December 21st - NASA launched Apollo 8 with its crew of Frank Borman, Jim Lovell and William Anders.

The Apollo 8 Moon mission was the first manned mission to leave Earth orbit and go into orbit around another celestial object.

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On this day in 1988 - December 21st - Cosmonauts Vladimir Titov and Musa Manarov returned to Earth after spending one year aboard Mir space station.

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On this day in 2020 - December 21st - the winter solstice occurred at 10:02 UCT.

This is the shortest day of the year in the northern hemisphere and the North Pole is at its maximum tilt away from the Sun. The southern hemisphere has its longest day and the South Pole is at its maximum tilt towards the Sun.

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On this day in 1672 - December 23rd - the winter solstice occurred at 10:02 UCT.

Jean-Dominique Cassini discovered Saturn's moon Rhea.

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On this day in 1968 - December 24th - Apollo 8 entered lunar orbit.

The crew were the first humans to view Earth as a whole planet, the first to orbit another world, and the first to see the far side of the Moon. They made a live Christmas Eve broadcast to the Earth as they circled the Moon.

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On this day in 1758 - December 25th - German amateur astronomer Johann Georg Palitzsch became the first to view Halley's Comet on its return to the inner solar system.

The comet's return had been predicted by the English scientist and astronomer Edmond Halley, after whom it was subsequently named.

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On this day in 2003 - December 25th - the European Mars Express and British Beagle 2 arrived at Mars.

Beagle 2 was damaged on landing and never responded, but the orbiter Mars Express is still returning data.

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On this day in 2004 - December 25th - the Huygens probe separated from the Cassini spacecraft.

Huygens went on to land on Saturn's moon Titan, and Cassini studied the Saturnian system until 2017.

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On this day in 1780 - December 26th - Mary Somerville was born in Jedburgh, Scotland.

Somerville was one of the leading lights of 19th century science. She was an able mathematician and she published books on developments in astronomy, physics and geography. Somerville was honored by several learned societies, even when she would not have been allowed to attend their meetings.

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