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On this day in 1919 – April 10th – John C. Houbolt was born.

Houbolt, an American aerospace engineer, is credited with leading the team behind the lunar orbit rendezvous (LOR) that was used to land humans on the Moon and return them to Earth. Using LOR, NASA saved time and billions of dollars by efficiently using existing rocket technology.

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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 to search for signs of life in distant planetary systems through interstellar radio waves.

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On this day in 1980 – April 11th – NASA's Viking 2 lander astrobiology mission ended.

The lander operated on the surface for 1316 days, and was turned off on April 11, 1980 when its batteries failed.

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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 1961 – April 12th – Soviet cosmonaut Yuri Gagarin was the person to orbit the Earth.

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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 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 and mathematician Christiaan Huygens was born.

Huygens was a prominent scientist in his day, his varied contributions including the invention of the pendulum clock, and the discovery of Saturn's moon Titan. NASA named its Titan lander after him.

Last edited by Mona - Astronomy; 04/15/17 07:47 PM.
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On this day in 1971 – April 19th – Salyut 1 was launched.

Salyut 1 was launched by the Soviet Union and it was the first ever manned space station.

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On this day in 1967 – April 20th – Surveyor 3 landed on the Moon.

It was part of a NASA uncrewed program to explore the surface of the Moon, and as unique in that it was the only such probe to be visited by astronauts.

Last edited by Mona - Astronomy; 04/23/17 09:46 AM.
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On this day in 1858 – April 23rd – Max Planck was born.

Planck was a German theoretical physicist best known as the originator of quantum theory. His work won him the Nobel Prize in Physics in 1918. The European Space Agency (ESA) named a space observatory for him - it mapped the cosmic microwave background from 2009-2013.

Last edited by Mona - Astronomy; 04/25/17 08:30 AM.
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