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On this day in 1671 - October 25th - Jean Dominique Cassini discovered Iapetus, moon of Saturn.

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On this day in 1789 - October 25th - the German astronomer Samuel Heinrich Schwabe was born.

He is best known for his work on sunspots and the discovery of the 11-year sunspot cycle.

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On this day in 1902 - October 26th - American astronomer Henrietta Hill Swope was born in St. Louis, Missouri.

She is best known for his work on variable stars, especially the study of Cepheid variables which can be used to measure the distances to other galaxies.

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On this day in 1961 - October 27th - SA-1, the first Saturn space launch vehicle, was launched from Cape Canaveral, Florida.

This was the first mission of the Apollo program - Saturn V space launch vehicles eventually took astronauts to the Moon.

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On this day in 1971 - October 28th - SA-1, the United Kingdom became the sixth nation to launch a satellite.

The Prospero satellite, the only satellite launched by a British rocket, carried a series of experiments to investigate the effects of the space environment.

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On this day in 1971 - October 30th - SA-1, the European Space Agency (ESA) launched its first successful Ariane 5 rocket.

The Ariane 5, Europe's most powerful launch vehicle, has been used to launch the XMM-Newton X-ray observatory, numerous telecom satellites, all of the International Space Station ATV resupply ships, the Herschel Space Observatory, and the Rosetta mission.

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On this day in 2005 - October 31st - the Hubble Space Telescope discovery of two new moons of Pluto was announced.

The moons were later named Nix and Hydra.

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On this day in 1930 - October 31st - Apollo astronaut Michael Collins was born.

Collins, a former Air Force test pilot, was the Command Pilot for the Apollo 11 mission.


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On this day in 1919 - November 1st - Anglo-Austrian mathematician and cosmologist Hermann Bondi was born.

Bondi was a distinguished academic and Fellow of the Royal Society. Among many positions outside academia, from 1967-1971, he served as Director-General of the European Space Research Organisation (ESRO) which later became the European Space Agency, (ESA).

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On this day in 1917 - November 2nd - the 100-inch telescope on Mount Wilson saw first light.

Edwin Hubble would make observations with this telescope that showed there was much more to the Universe than just our own Galaxy.

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