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Re: 2019: On this day . . . [Re: Mona - Astronomy] #930878 04/25/19 07:04 AM
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On this day in 2017 - April 26th - the Cassini spacecraft made the first dive of the Grande Finale of its 13-year study of the Saturnian system.

It was the first of a series of close orbits that involved Cassini diving between Saturn and its rings. Astronomers collected data to learn more about the origins, mass, and age of Saturn's rings, as well as the mysteries of the gas giant's interior.


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Re: 2019: On this day . . . [Re: Mona - Astronomy] #930881 04/26/19 07:32 AM
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On this day in 1900 - April 28th - Dutch astronomer Jan Oort was born.

Oort made major contributions to the understanding of the Milky Way and was a pioneer in radio astronomy. He realized that the orbits of comets “implied there was a lot more solar system than the region occupied by the planets.” The Oort cloud of comets that surrounds the Solar System was named for him.


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Re: 2019: On this day . . . [Re: Mona - Astronomy] #930886 04/27/19 07:44 AM
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On this day in 1906 - April 28th - Dutch-American astronomer Bart Bok was born.

He's best known for his work on the structure and evolution of our Galaxy and the dark nebulae named for him. Click here to learn more about Bok globules.


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Re: 2019: On this day . . . [Re: Mona - Astronomy] #930893 04/28/19 08:33 AM
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On this day in 1928 - April 28th - American geologist and planetary scientist Gene Shoemaker was born.

Shoemaker was one of the founders of the study of planetary science. And with his wife Carolyn and David Levy, he was co-discoverer of Comet Shoemaker-Levy 9 which hit Jupiter.


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Re: 2019: On this day . . . [Re: Mona - Astronomy] #930899 04/29/19 07:43 AM
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On this day in 2003 - April 28th - NASA's Galaxy Evolution Explorer (GALEX) was launched.

GALEX, which operated until early 2012, was an orbiting space telescope observing galaxies in ultraviolet light. Its observations provided data about how galaxies, the basic structures of our Universe, evolve and change.


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Re: 2019: On this day . . . [Re: Mona - Astronomy] #930904 04/30/19 06:24 AM
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On this day in 2013 - April 29th - ESA's Herschel Space Observatory mission ended.

The infrared observatory was named after William Herschel, who discovered infrared radiation, and his sister and collaborator Caroline Herschel. The observatory was able to see the coldest and dustiest objects in space, but it needed liquid helium to cool its instruments. When that ran out, the mission ended.


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Re: 2019: On this day . . . [Re: Mona - Astronomy] #930907 05/01/19 08:12 AM
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On this day in 1949 - May 1st - Gerard Kuiper discovered Neptune's moon Nereid.

Nereid was the second known moon of Neptune. It was discovered over a century after William Lassell discovered the first one, Triton.


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Re: 2019: On this day . . . [Re: Mona - Astronomy] #930919 05/05/19 08:22 AM
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On this day in 1961 - May 5th - Alan Shepard became the first American in space, making a suborbital flight in Freedom 7.

Ten years later Shepard walked on the Moon as the commander of Apollo 14.


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Re: 2019: On this day . . . [Re: Mona - Astronomy] #930940 05/08/19 09:23 AM
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On this day in 2003 - May 9th - the Japanese mission Hayabusa ("peregrine falcon") was launched.

Hayabusa was the first mission to return a sample of material from an asteroid.


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Re: 2019: On this day . . . [Re: Mona - Astronomy] #930950 05/09/19 09:33 AM
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On this day in 1900 - May 10th - Cecilia Payne-Gaposchkin was born.

Cecilia Payne, in her PhD thesis, was the first to propose that stars stars were composed mainly of hydrogen and helium.


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