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On this day in 2014 – September 22nd – NASA's MAVEN mission went into orbit around Mars.

MAVEN (Mars Atmosphere and Volatile EvolutioN) is studying the Martian atmosphere.


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On this day in 1783 – September 23rd – Caroline Herschel discovered NGC 253 The Sculptor Galaxy.

Also known as the Silver Coin or Silver Dollar Galaxy, NGC 253 is a starburst spiral galaxy in the constellation Sculptor.


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On this day in 1846 – September 23rd – Neptune was discovered by Johann Galle and his colleague Heinrich Louis d’Arrest at the Berlin Observatory.

Galle had received calculations from Urbain LeVerrier which showed where there might be a new planet, and they found the planet that very night. Eventually, it was named Neptune after the Roman sea god.


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On this day in 1930 – September 24th – John Young was born in San Francisco, California.

Young had a varied and distinguished career, which in 1972, included being the Commander of Apollo 16 and the ninth person to walk on the Moon.


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On this day in 2014 – September 24th – the Indian Space Research Organisation (ISRO)'s Mars Orbiter Mission (MOM) entered Mars orbit.

MOM was India's first interplanetary mission, and it's still studying Mars.


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On this day in 1634 – September 25th – Danish astronomer Ole Christensen Rømer was born in Aarhus, Denmark.

He is best known for making the first quantitative measurements of the speed of light by precisely measuring the length of time between eclipses of Jupiter by one of its moons.


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On this day in 1814 – September 27th – American astronomer Daniel Kirkwood was born in Harford County, Maryland.

Kirkwood is best known for his study of asteroid orbits. When arranging the then-growing number of discovered asteroids by their distance from the Sun, he noted several gaps, now named Kirkwood gaps. He associated these gaps with orbital resonances with the orbit of Jupiter.


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On this day in 2007 – September 27th – NASA's Dawn spacecraft was launched.

Dawn orbited and studied the asteroid Vesta, and then went on to study dwarf planet Ceres. The mission has ended, but the spacecraft remains in orbit around Ceres.


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On this day in 1605 – September 28th – French astronomer and mathematician Ismaël Bullialdus was born in Loudon.

Often regarded as ‘the most noted astronomer of his generation’ he wrote several books, the most famous being Astronomia Philolaica, in which he supported Johannes Kepler’s elliptical planetary orbits. Bullialdus was also a defender of the views and ideas of Copernicus and Galileo.


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On this day in 1765 – September 29th – German astronomer Karl Ludwig Harding was born in Lauenburg.

He is best remembered for the discovery of the third asteroid - Juno - made on 1 Sep 1804 while working at the private observatory of his countryman and fellow astronomer, Johann Hieronymus Schröter.


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