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Yes, indeed, Angie. Many ideas are born before the time in which they can be implemented. My article on the Moon briefly tells of the Ukrainian known as Yuri Kondratyuk who originated the LOR that Houbolt persuaded NASA to use for Apollo. Kondratyuk did his brilliant work over two decades before his death in WWII and well before the Space Age. Fortunately, his papers were smuggled out of the Soviet Union after the war.


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On this day in 1960 – April 11th – Project Ozma began.

Cornell University astronomer Frank Drake initiated this project. It was a pioneering SETI (Search for ExtraTerrestrial Intelligence) experiment that searched for signs of life in distant planetary systems by monitoring interstellar radio waves.


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On this day in 1970 – April 11th – NASA's Apollo 13 Moon mission was launched.

This was the ill-fated mission that didn't make onto the Moon, but with the assistance of a lot of smart people, the astronauts made it safely back to Earth.


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On this day in 1984 – April 11th – the space shuttle Challenger redeployed the Solar Max satellite following their retrieval and repair of it.


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On this day in 1986 – April 11th – Halley's Comet was at its closest to the Earth.


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On this day in 2006 – April 11th – ESA's Venus Express was inserted into orbit around Venus.

The mission provided an enormous amount of data on the Venusian atmosphere until the European Space Agency concluded it in December 2014. In addition to helping to understand the atmosphere of Venus, it also contributed to an a general understanding of atmospheric dynamics in general, including climate change on Earth.


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On this day in 1961 – April 12th – Soviet cosmonaut Yuri Gagarin became the first spaceman.

Gagarin made the historic first orbit of the Earth in the Vostok 1 craft.


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On this day in 1597 – April 13th – Giovanni Battista Hodierna was born.

Hodierna was a Sicilian astronomer at the court of the Duke of Montechiaro. Pre-dating Charles Messier by over a century, he compiled a sky catalog that included a number of nebulous objects that might be confused with comets.


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On this day in 1629 – April 14th – Dutch scientist, mathematician and inventor, Christiaan Huygens, was born in The Hague.

Huygens was a prominent scientist in his day. His varied contributions included the invention of the pendulum clock, and the discovery of Saturn's moon Titan. ESA (European Space Agency) named its Titan lander after him.


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On this day in 1868 – April 14th – Irish astronomer and mathematician Annie Scott Dill Maunder (née Russell) was born in Strabane, County Tyrone.

She worked at Greenwich Observatory, but had to give up her job when she married her colleague Edward Maunder. However they made a formidable team, going on solar eclipse expeditions together and collaborating on publications.


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