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#927848 - 05/16/18 10:17 AM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1718 - May 15th - Johannes Kepler discovered the simple mathematical rule governing the orbits of the solar system's planets, now recognized as Kepler's Third Law of planetary motion.

Kepler's three laws described the orbital motions of the planets in a solar system where they orbited the Sun, not the Earth.



Mona Evans
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#927859 - 05/17/18 07:40 AM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 2011 - May 16th - STS-134 Endeavour launched, the final space shuttle mission.


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#927873 - 05/18/18 09:54 AM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1836 - May 17th - English scientist and astronomer Norman Lockyer was born.

Along with the French scientist Pierre Janssen he is credited with discovering the gas helium which was first discovered in the light spectrum of the Sun decades before any was found on Earth.


Mona Evans
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#927874 - 05/18/18 10:01 AM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1968 - May 17th - the first ESRO satellite was successfully launched.

The European Space Research Organisation (ESRO) was a precursor to the European Space Agency (ESA). ESRO-2B was the first mission controlled by teams at the European Space Operations Centre in Darmstadt, Germany. It was mainly intended to study X-ray and particle emissions from the Sun.


Mona Evans
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#927901 - 05/19/18 07:58 PM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1969 - May 18th - Apollo 10 was launched.

Apollo 10 was a dress rehearsal for the first Moon landing, testing all of the components and procedures, just short of actually landing.


Mona Evans
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#927908 - 05/20/18 04:39 PM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 2009 - May 18th - The final spacewalk to service the Hubble Space Telescope took place.

Amongst other things the astronauts installed some new instruments, made repairs to two instruments, replaced old batteries, and added new gyroscopes.


Mona Evans
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#927926 - Yesterday at 06:14 PM Re: 2018: On this day . . . [Re: Mona - Astronomy]  
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On this day in 1990 - May 20th - the Hubble Space Telescope sent back its first image, that of several stars captured with its Wide Field/Planetary Camera.

Unfortunately, they then discovered there was a flaw in the main mirror which meant fuzzy images for three years until the first shuttle servicing mission. Interestingly, the images were still much better than the ones from ground-based telescopes.


Mona Evans
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