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On this day in 1802 – March 28th – Heinrich Olbers discovered Pallas.

Pallas was the second asteroid to be discovered, and it was counted as a planet at the time, as Ceres had been.

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On this day in 1807 – March 29th – Heinrich Olbers discovered Vesta.

Vesta was the third asteroid to be discovered, and it was counted as a planet at the time, as Ceres had been.

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On this day in 1974 – March 29th – Mariner 10 made the first ever flyby of Mercury.

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

Pioneer 10 was the first spacecraft to go through the asteroid belt and the first to fly by Jupiter. After the end of the mission, there was still contact with the spacecraft to record telemetry as it headed out into the Kuiper Belt.

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On this day in 1845 – April 2nd – French physicists Leon Foucault and Louis Fizeau made the first successful photograph of the Sun.

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On this day in 1966 – April 3rd – the Soviet spacecraft Luna 10 was the first to be inserted into orbit around the Moon.

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

Pioneer 11 was the first spacecraft to encounter Saturn and it followed Pioneer 10 into the far reaches of the Solar System.

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On this day in 1995 – April 7th – NASA's Compton Gamma Ray Observatory was deployed by astronauts on the space shuttle.

It transformed our knowledge of the high-energy sky, producing the first ever all-sky survey in gamma rays.

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On this day in 2001 – April 7th – NASA's Mars Odyssey orbiter was launched.

The spacecraft's primary mission was meant to last 32 months. It's still in service.

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On this day in 1959 – April 9th – NASA selected its first group of astronauts known as the Mercury Seven.

They were the pioneers of the US manned space program: Scott Carpenter, Gordon Cooper, John Glenn, Gus Grissom, Wally Schirra, Alan Shepard, and Deke Slayton. None of the Mercury Seven are still alive. John Glenn, who died last year, was the last of the group.

Last edited by Mona - Astronomy; 04/10/17 12:06 PM.
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