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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929829 09/26/18 02:26 PM
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On this day in 1846 - September 23rd - Johann Galle discovered Neptune.

Urbain LeVerrier sent Galle some calculations showing where there might be a new planet, and Galle found it that night. Eventually, it was named Neptune, after the Roman sea god.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929834 09/27/18 08:58 AM
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On this day in 1930 - September 24th - John Young was born.

As a NASA astronaut, Young had a long career which included being the ninth person to walk on the Moon when he was the Commander of the Apollo 16 mission in 1972.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929836 09/28/18 07:08 AM
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On this day in 2914 - September 24th - the Indian Space Research Organisation (ISRO)'s Mars Orbiter Mission entered Mars orbit.

MOM was the first Indian interplanetary mission and is still studying Mars.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929837 09/28/18 07:09 AM
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On this day in 1814 - September 27th - American astronomer Daniel Kirkwood was born.

Kirkwood is best known for his study of asteroid orbits. When arranging the then-growing number of discovered asteroids by their distance from the Sun, he noted several gaps, now named Kirkwood gaps. He associated these gaps with orbital resonances with the orbit of Jupiter.





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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929841 09/29/18 08:08 AM
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On this day in 2007 - September 27th - NASA's Dawn spacecraft was launched.

Dawn orbited and studied the asteroid Vesta and then went on to dwarf planet Ceres where it is still in orbit.




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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929848 09/30/18 09:44 AM
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On this day in 2016 - September 30th - ESA's Rosetta mission ended with a controlled descent to the surface of Comet Churyumov-Gerasimenko.



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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929849 10/01/18 09:14 AM
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On this day in 1880 - September 30th - Henry Draper took the first photograph of the Orion Nebula.

Draper was an American physician, professor of medicine, keen astronomer and pioneer of astrophotographer. Stars with HD numbers are listed in the Henry Draper Catalog compiled by Harvard College Observatory and funded by Draper's widow, Anna Draper.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929854 10/03/18 09:00 AM
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On this day in 1958 - October 1st - NASA was founded.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929857 10/04/18 08:46 AM
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On this day in 1897 - October 1st - the 40-inch refracting telescope was dedicated at Yerkes Observatory in Williams Bay, Wisconsin.

From 1897-1909 it was the world's largest telescope. It's still the world's largest refractor.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929862 10/04/18 03:27 PM
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On this day in 1920 - October 2nd - Italian mathematician and engineer Giuseppe 'Bepi' Colombo was born.

Colombo, known as "Grandfather of the fly-by", suggested to NASA in 1970 that its Mariner 10 mission could achieve a second fly-by of Mercury by making use of the planet's gravity. A careful analysis showed this could indeed be done and was incorporated into the mission. ESA (European Space Agency) has commemorated him by naming its Mercury mission BepiColombo.


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