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#925645 - 01/06/18 01:16 PM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1998 - January 6th - NASA's Lunar Prospector was launched.

The mission was designed to investigate the Moon from low polar orbit. This would include mapping the surface composition, locating lunar resources, and measuring magnetic and gravity fields.


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#925656 - 01/07/18 06:12 AM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1610 - January 7th - Galileo wrote the first letter in which he described his observations of the Moon through a telescope.

In those days, the Moon was assumed to be a perfectly smooth sphere. However Galileo saw that the surface was uneven with mountains, plains and valleys.


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#925673 - 01/08/18 06:31 AM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1610 - January 7th - Galileo first saw three of Jupiter's moons.

The three objects he saw in his telescope are now known as Callisto, Io and Europa, three of the four Galilean moons.

Last edited by Mona - Astronomy; 01/13/18 08:05 AM.

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#925674 - 01/08/18 06:38 AM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1587 - January 8th - Johannes Fabricius was born.

Fabricius was a German/Frisian astronomer, eldest son of David Fabricius who was also an astronomer. In their solar observing they discovered sunspots about the same time as, and independently of, Galileo.


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#925693 - 01/09/18 08:15 AM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1942 - January 8th - Stephen Hawking was born.

Hawking is possible the most famous living scientist. For thirty years he held the prestigious post of Lucasian Professor at the University of Cambridge, though he retired a number of years ago. (Isaac Newton was once Lucasian Professor. He's best known for his work on black holes.


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#925704 - 01/09/18 07:20 PM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1839 - January 9th - Thomas Henderson published his determination of the distance to Alpha Centauri.

Henderson had actually been the first person to calculate the distance to a fixed star by using stellar parallax. However he had delayed publishing his results, and the credit for being first went elsewhere.


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#925711 - 01/10/18 06:11 AM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1946 - January 10th - the US Army Signal Corps had the first successful echo detection of a radar signal bounced off the Moon.

It was part of the first experiment in radar astronomy, a technique used decades later to map the planet Venus.


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#925722 - 01/11/18 05:19 AM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1787 - January 11th - William Herschel discovered the Uranian moons Oberon and Titania.


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#925745 - 01/12/18 06:19 AM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1907 - January 12th - Sergei Korolev was born.

Korolev was the mastermind of the Soviet space program, and a state secret referred to only as the Chief Designer.


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#925760 - 01/12/18 06:23 PM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 2005 - January 12th - NASA's Deep Impact spacecraft was launched.

Deep Impact was the first space mission to study the interior composition of a comet.


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