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On this day in 1935 - October 3rd - Apollo 16 astronaut "Charlie" Duke was born.

Duke was the Lunar Module Pilot of Apollo 16 and the tenth and youngest person to walk upon the surface of the Moon.

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On this day in 1957 - October 4th - the Soviet Union launched Sputnik 1.

Sputnik was the world's first successful artificial satellite.

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On this day in 1959 - October 4th - the Soviet Union launched Luna 3.

The spacecraft captured humanity's first-ever view of the far side of the Moon.

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On this day in 1882 - October 5th - Robert Goddard was born.

Goddard was an American engineer, professor, physicist, and inventor who is credited with creating and building the world's first liquid-fuelled rocket. Although he received little public support in his lifetime, he's now considered one of the founding fathers of modern rocketry.

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On this day in 1923 - October 5th - Edwin Hubble discovered a Cepheid variable in M31 (the Andromeda Galaxy).

Cepheid variable stars, based on the work of Henrietta Leavitt, can be used as distance indicators. Hubble was able to show that M31 was too far away to be an object in our own Galaxy.

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On this day in 1962 - October 5th - the European Southern Observatory (ESO) was founded.

It's a highly productive astronomical observatory, providing state-of-the-art research facilities to astronomers and astrophysicists of many countries.

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On this day in 1732 - October 6th - English astronomer Nevil Maskelyne was born in London.

He was the fifth Astronomer Royal of England, holding the post for 46 years. Maskelyne founded the Nautical Almanac and Astronomical Ephemeris, the first nautical almanac to contain data dedicated to the convenient determination of longitude at sea.

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On this day in 1885 - October 7th - Niels Bohr was born.

Bohr was the Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922.

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On this day in 1873 - October 8th - Danish chemist and astronomer Ejnar Hertzsprung was born in Copenhagen.

The Hertzsprung-Russell diagram is a classification system for explaining stellar types and stellar evolution. Hertzsprung and American astronomer Henry Norris Russell independently made the discoveries that created the diagram.

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On this day in 1873 - October 9th - German physicist and astronomer Karl Schwarzschild. was born.

Although his best known research relates to general relativity, Schwarzschild worked on a wide range of subjects including celestial mechanics quantum mechanics, spectroscopy and instrumental astronomy.


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