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Re: 2018: On this day . . . [Re: Mona - Astronomy] #928660
06/30/18 10:38 PM
06/30/18 10:38 PM
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On this day in 1990 - June 30th - the joint ESA/NASA Ulysses mission came to an end after 18 years in service.

Ulysses was the first ever spacecraft to explore space above and below the Sun's poles. When it was launched it had a nominal lifetime of five years.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #928661
06/30/18 10:39 PM
06/30/18 10:39 PM
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On this day in 1917 - July 1st - the 100" mirror for the Hooker telescope arrived at Mt Wilson Observatory.

This telescope was the biggest in the world for three decades. Edwin Hubble calculated the distance to Andromeda from a Cepheid variable he discovered there with the telescope. It showed Andromeda was a separate galaxy. Hubble and Humason also observed the redshifts of a number of galaxies and found that they were moving away from us.




Last edited by Mona - Astronomy; 07/01/18 02:51 PM.

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Re: 2018: On this day . . . [Re: Mona - Astronomy] #928683
07/02/18 01:16 PM
07/02/18 01:16 PM
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On this day in 1985 - July 2nd - the European Space Agency (ESA) launched the Giotto probe to study Halley's Comet.

Giotto was the first spacecraft ever to make close up observations of a comet.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #928684
07/02/18 01:16 PM
07/02/18 01:16 PM
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On this day in 1985 - July 2nd - the European Space Agency (ESA) launched the Giotto probe to study Halley's Comet.

Giotto became the first spacecraft ever to make close up observations of a comet.





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Re: 2018: On this day . . . [Re: Mona - Astronomy] #928701
07/03/18 02:29 PM
07/03/18 02:29 PM
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On this day in 1935 - July 3rd - geologist and Apollo 17 astronaut Harrison Schmitt was born.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #928716
07/04/18 02:49 PM
07/04/18 02:49 PM
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On this day in 1868 - July 4th - American astronomer Henrietta Swan Leavitt was born.

Her discovery of the relationship between the period and the luminosity of Cepheid variable stars made possible Edwin Hubble's work on galactic distances.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #928729
07/04/18 09:22 PM
07/04/18 09:22 PM
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On this day in 2005 - July 4th - NASA's Deep Impact probe collided with comet Tempel 1.

The Deep Impact mission was designed to study the interior composition of the comet Tempel 1 (9P/Tempel) by releasing an impactor into it.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #928756
07/05/18 06:57 AM
07/05/18 06:57 AM
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On this day in 1054 - July 4th - Chinese astronomers observed the supernova explosion that created the Crab Nebula (Messier 1) in the constellation Taurus.

The supernova would have occurred some 6500 years before it was observed on Earth, since it's around 6500 light years away.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #928766
07/06/18 05:55 AM
07/06/18 05:55 AM
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On this day in 1997 - July 4th - NASA's Mars Pathfinder landed on Mars.

The robotic spacecraft consisted of a lander, renamed the Carl Sagan Memorial Station, and a wheeled robotic Mars rover named Sojourner. It was the first successful Mars rover.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #928785
07/06/18 08:51 PM
07/06/18 08:51 PM
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On this day in 2016 - July 5th - NASA's Juno mission went into polar orbit around Jupiter.

Juno's mission is to explore Jupiter, seeking to unlock secrets of the giant planet and our solar system.


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