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On this day in 1956 - October 17th - Mae Jemison was born.

Jemison was a NASA astronaut and the first African American woman in space. She is also been an engineer, physician, university professor and businesswoman.


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On this day in 2002 - October 17th - the European Space Agency (ESA) launched the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL).

For six years it was the most sensitive gamma ray observatory ever, and it continues its operations in detecting some of the most energetic radiation coming from space.


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On this day in 1967 - October 18th - Venera 4 made the first direct studies of Venus’s atmosphere.

The Soviet probe was the first probe to perform a successful in-place analysis of the environment of another planet.


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On this day in 1910 - October 19th - Indian-American astrophysicist and Nobel laureate Subrahmanyan Chandrasekhar was born.

He's known for his work in stellar evolution, including the Chandrasekhar Limit. That is the dividing line between the mass of a star that has spent its nuclear fuel and will collapse into a white dwarf and one massive enough to go out with a bang - a supernova. It's about 1.4 times the Sun's mass.


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On this day in 1967 - October 19th - the European Space Agency's (ESA) ExoMars arrived at Mars.

There were two parts to the mission. The Trace Gas Orbiter (TGO) was successfully inserted into orbit and is working as expected. However due to a systems malfunction, the experimental lander Schiaparelli crash landed on Mars.


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On this day in 1923 - October 21st - the Deutsches Museum in Munich, Germany presented the world's first public planetarium show.


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On this day in 2008 - October 21st - India's space agency, ISRO, launched the Chandrayaan-1 lunar probe.

It was India's first satellite to leave Earth orbit, and the mission also included the first Indian deep space radio communications antenna.


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On this day in 1905 - October 22nd - American physicist and radio engineer Karl Jansky was born.

In August 1931 Jansky first discovered radio waves emanating from the Milky Way. He's considered one of the founding figures of radio astronomy.


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On this day in 1975 - October 22nd - the Soviet Union's Venera 9 went into orbit around Venus.

The mission included an orbiter - the first to orbit another planet - and a lander, which was the first to return images from another planet.


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On this day in 1969 - October 23nd - the discovery of 67P/Churyumov-Gerasimenko was announced by the discoverers to the Central International Bureau of Astronomical Telegrams.

This is the comet on which ESA's Rosetta spacecraft and the lander Philae lie after two years of studying it.


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