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#926498 - 02/21/18 08:40 PM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1994 - February 20th - the US probe Clementine entered lunar orbit.

Clementine's mission was to make scientific observations of the Moon, and to test sensors and spacecraft components under extended exposure to the space environment.


Mona Evans
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#926507 - 02/22/18 01:18 PM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1978 - February 22nd - the first Navstar GPS satellite was launched.

The Global Positioning System (GPS) was originally called Navstar GPS.


Mona Evans
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#926519 - 02/22/18 10:29 PM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1986 - February 22nd - Sweden's first satellite, Viking, was launched.

Viking was launched as a piggyback payload on an Ariane 1 rocket that carried a French remote sensing satellite and it conducted a successful magnetospheric research mission until 12 May 1987.


Mona Evans
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#926529 - 02/23/18 06:51 AM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1990 - February 23rd - Pioneer 11 crossed the orbit of Neptune on its way out of the Solar System.

The spacecraft went beyond the most distant planet, but since there are dwarf planets and many other objects beyond Neptune, the spacecraft still hasn't left the Solar System.


Mona Evans
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#926535 - 02/23/18 02:55 PM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1987 - February 23rd - the light from supernova SN 1987A reached Earth.

The supernova occurred in the Tarantula Nebula in our neighboring galaxy the Large Magellanic Cloud. It was the closest supernova seen in nearly four hundred years, visible to the unaided eye in the southern hemisphere. It has greatly increased our understanding of this spectacular phenomenon.





Mona Evans
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#926543 - 02/23/18 09:57 PM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1945 - February 23rd - Ukranian astronomer Svetlana Gerasimenko was born.

Gerasimenko was the co-discoverer of comet 67P/Churyumov–Gerasimenko, the comet which was studied by the Rosetta mission. Both the Rosetta spacecraft and the lander Philae are on the comet as it continues its orbit.





Mona Evans
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#926547 - 02/24/18 04:13 PM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1968 - February 24th - the discovery of the first pulsar was announced.

A pulsar is a fast-rotating neutron star that emits a beam of electromagnetic radiation. We can only detect it when it's pointing towards us, rather like a lighthouse, so it seems to pulse. A neutron star is the remnant of a massive star following the collapse of its core in a supernova explosion.


Mona Evans
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