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On this day in 1819 – June 5th – British mathematician and astronomer John Couch Adams was born in Laneast, Cornwall.

His most famous achievement was predicting the existence and position of Neptune, using mathematics. But French astronomer Urbain LeVerrier had independently made the calculations and the planet was discovered using LeVerrier's calculations. (Who discovered Neptune?).

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On this day in 1971 – June 5th – Soyuz 11 was launched with the first crew to occupy the Salyut 1 space station.

Salyut 1 was the very first space station - it was launched into low earth orbit by the Soviet Union in April 1971.

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On this day in 1992 – June 7th – the Extreme Ultraviolet Explorer (EUVE) was launched.

This NASA space telescope was the first one designed especially for the short-wave ultraviolet range. It compiled an a sky survey of 801 astronomical targets.

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On this day in 1625 – June 8th – Italian-French astronomer Giovanni Domenico (Jean-Dominique) Cassini was born in Perinaldo, Italy.

Cassini was one of the most important astronomers of the 17-18th centuries, and was the first of four Cassinis to direct the Paris Observatory. The NASA/ESA/ASI Cassini-Huygens mission to Saturn bore his name because of his study of Saturn, which included the discovery of four of Saturn's moons.

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On this day in 1812 – June 9th – German astronomer Johann Gottfried Galle was born in Radis, Kingdom of Saxony.

Galle is best known for his being the first person to see the planet Neptune, knowing what he was seeing. This followed his search for the planet using the calculations Urbain Le Verrier had sent him. (Who discovered Neptune?)

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On this day in 1975 – June 9th – launched the Venera 9 mission.

It consisted of an orbiter and a lander. The orbiter was the first spacecraft to orbit Venus, while the lander was the first to return images from the surface of another planet.

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On this day in 2003 – June 10th – NASA's Mars rover Spirit was launched.

The original plan was for a three-month mission, but the mission wasn't finally terminated until May 2011.

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On this day in 1985 – June 11th – the descent module of the Soviet craft Vega 1 arrived on Venus.

After releasing the descent module, the probe Vega 1 got a gravitational assist from Venus and continued its journey to intercept Comet Halley.

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On this day in 1922 – June 12th – Italian astrophysicist and populariser of science Margherita Hack was born in Florence.

She became a full professor of astronomy at the University of Trieste and the administrator of the Trieste Astronomical Observatory, the first woman in Italy to hold either of such positions. Hack received national and international recognition for her innovations at the observatory and her promotion of astronomy to the public.

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On this day in 1611 – June 13th – the first documented report in Europe on the phenomenon of sunspots was published.

Narration on Spots Observed on the Sun and Their Apparent Rotation with the Sun was the work of Frisian/German astronomer Johannes Fabricius.

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