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On this day in 2011 – March 17th – NASA's Messenger spacecraft went into orbit around Mercury.

Messenger was the first craft ever to orbit Mercury.

Last edited by Mona - Astronomy; 03/18/17 02:29 AM.

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On this day in 1965 – March 18th – the Soviet spacecraft Voskhod 2 was launched.

Cosmonaut Alexei Leonov became the first person to leave a spacecraft for a "spacewalk".


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On this day in 1865 – March 21st – American astronomer Antonia Maury was born.


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

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On this day in 1997 – March 22nd – Comet Hale-Bopp made its closest approach to Earth.

Here is the two-tailed Hale-Bopp, probably the most widely observed comet of the twentieth century. It's also known as the Great Comet of 1997.


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On this day in 1749 – March 23rd – Pierre-Simon Laplace was born.

Laplace was a brilliant French mathematician, astronomer, and physicist who is sometimes called "France's Newton". He accounted for the observed deviations of planets from their theoretical orbits by applying Newton's theory of gravitation to the problem.


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On this day in 1840 – March 23rd – American scientist John William Draper produced the first detailed photograph of the Moon.


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On this day in 2001 – March 23rd – the Soviet/Russian space station Mir was deorbited.

Mir was the first space station assembled in orbit and the first continuously inhabited long-term orbital research station.


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On this day in 1893 – March 24th – German astronomer Walter Baade was born.

Baade, who worked at Mt Wilson Observatory for many years, defined two distinct populations of stars and his discovery that there are two types of Cepheid variable star meant that his recalculation of the known universe doubled the size calculated by Hubble.


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On this day in 1655 – March 25th – Christiaan Huygens discovered Saturn's moon Titan.

ESA's Titan lander was named for Huygens, a prominent Dutch mathematician and scientist.


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On this day in 1972 – March 27th – the Soviet probe Venera 8 was launched.

Venera 8 made the first completely successful landing on Venus and sent data from the surface for fifty minutes before succumbing to the pressure and searing temperature.

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

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