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On this day in 1997 – March 31st – Pioneer 10's mission was officially ended.

NASA probe Pioneer 10 completed the first mission to Jupiter and later was the first spacecraft to achieve escape velocity from the Solar System. Although NASA ended the probe's mission, it continued to monitor signals for another six years.

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On this day in 1973 – April 5th – Pioneer 11 was launched.

Pioneer 11 followed Pioneer 10 through the asteroid belt and past Jupiter, but It was the first probe to fly by Saturn.

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

Houbolt isn't a well-known name, but he was an aerospace engineer who led the team that developed the lunar orbit rendezvous (LOR) flight path. It was what enabled NASA to meet President Kennedy's 1961 challenge for lunar success “before this decade is out”.

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

It was Frank Drake's project to search for signals from intelligent aliens. A radio telescope was used to observe the stars Epsilon Eridani and Tau Ceti over a 4-month period. (They didn't find anything.)

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On this day in 1961 – April 12th – Yuri Gagarin became the first human in space when he made one orbit of Earth in Vostok 1.

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On this day in 1629 – April 14th – Christiaan Huygens was born.

The probe to Saturn's moon Titan was named for Huygens, Dutch astronomer, physicist and mathematician, who discovered the moon.

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On this day in 1971 – April 19th – Salyut 1 was launched.

The Soviet Union launched Salyut 1, which was the first ever space station.

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

NASA's Surveyor program sent robotic probes to the Moon to learn more about what would be needed for manned landings. Surveyor 3's camera was retrieved two years later and brought back to Earth by Apollo 12 astronauts.

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On this day in 1990 – April 25th – the Hubble Space Telescope was deployed.

The crew of the STS-31 space shuttle mission took the telescope into space on the shuttle Discovery.

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On this day in 1900 – April 28th – Jan Oort was born.

Jan Oort was a Dutch astronomer who was a pioneer in radio astronomy and made major contributions to the understanding of the Milky Way.

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