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On this day in 2013 – February 15th – a meteor explosion occurred over Chelyabinsk in Russia causing around 1500 injuries.

The meteoroid was about 20 meters across with a mass of 12,000-13,000 metric tonnes. Fortunately, the explosion occurred high in the atmosphere and the atmosphere absorbed much of the energy. However the shock waves caused a lot of damage, and many of the injuries were from flying glass.

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On this day in 1514 – February 16th – Georg Joachim de Porris was born in Feldkirch in present-day Austria.

The mathematician, astronomer and cartographer, better known as Rheticus, is best remembered for facilitating the publication of De Revolutionibus Orbium Coelestium (On the Revolutions of the Heavenly Spheres) by Copernicus.

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On this day in 1914 – February 16th – Gerard Kuiper discovered Miranda, a moon of Uranus.

It was the first discovery of a Uranian moon since William Lassell's discovery of Ariel and Umbriel in 1851.

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On this day in 1723 – February 17th – German cartographer and astronomer Tobias Mayer was born in Marbach, Württemberg.

Mayer's chart of the full moon was the standard for half a century, but he's best known for his lunar tables. The accuracy of the lunar positions (and the theory behind them) enhanced the lunar distance method for determining longitude at sea. It enabled navigators to find longitude accurately to half a degree.

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On this day in 1996 – February 17th – NASA's NEAR Shoemaker spacecraft was launched.

The spacecraft did a fly-by of asteroid Mathilde and then went on to study asteroid Eros from orbit.

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On this day in 2018 – February 17th – it was the 5000th sol that NASA's Mars rover Opportunity had been on the red planet.

Opportunity's mission was originally planned for 90 sols. A sol is a Martian day, and it's just over 39.5 minutes longer than an Earth day. A severe planet-wide dust storm in the summer of 2018 would finally end Opportunity's amazing mission.

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On this day in 1677 – February 18h – Jacques Cassini was born at the Paris Observatory.

He was the son of the director of the observatory Jean Dominique Cassini, with whom he made numerous astronomical observations. Eventually, he took over his father's duties as head of the Paris Observatory and continued the astronomical work.

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On this day in 1930 – February 18h – Clyde Tombaugh discovered Pluto.

Pluto was considered to be the ninth planet for many years. It's now the largest known Kuiper Belt object, and is classified as a dwarf planet.

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On this day in 1473 – February 19th – Nicolaus Copernicus was born in Torun, Poland.

His work De revolutionibus orbium coelestium (On the Revolutions of the Celestial Spheres) set out his arguments for a heliocentric (sun-centered) system instead of a geocentric (Earth-centered) system.

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On this day in 1986 – February 19th – Mir was launched by the Soviet Union.

Mir was the first modular space station, and was assembled in orbit. It was the first continuously inhabited long-term research station in orbit. The failing station was deorbited in March 2001.

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