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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929522 08/18/18 07:47 AM
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On this day in 1877 – August 18th – Asaph Hall discovered Phobos, moon of Mars.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929530 08/19/18 07:54 AM
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On this day in 1868 - August 18th - during a total solar eclipse Pierre Janssen observed an unknown line in the spectrum of the Sun, which turned out to be a new element, helium.

The same result was found independently by British astronomer Norman Lockyer, and both Janssen's and Lockyer's communications were presented to the French Academy of Sciences on October 26, 1868.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929539 08/20/18 08:49 AM
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On this day in 1646 - August 19th - English astronomer John Flamsteed was born.

Flamsteed was the first Astronomer Royal at the Royal Observatory Greenwich and his star atlas was the standard for a nearly a century.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929558 08/21/18 11:58 AM
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On this day in 1891 - August 19th - American astronomer Milton Humason was born.

Humason's careful measurement of the radial velocities of several hundred galaxies underpinned the work of Edwin Hubble.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929570 08/22/18 08:46 AM
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On this day in 1982 - August 19th - Soviet cosmonaut Svetlana Savitskaya became the second woman to go into space.

Her flight on the Soyuz T-7 was 19 years after that of the first woman in space Valentina Tereshkova.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929582 08/23/18 09:27 AM
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On this day in 1977 - August 20th - NASA's Voyager 2 was launched.

It visited all four of the Solar System's gas giants and is the only spacecraft to have visited either Uranus or Neptune.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929597 08/24/18 10:19 AM
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On this day in 1975 - August 20th - NASA's Viking 1 was launched.


Viking 1 was the first of two spacecraft (along with Viking 2) sent to Mars as part of NASA's Viking program. A year after its launch it became the first spacecraft to land successfully on Mars and perform its mission.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929615 08/25/18 10:26 AM
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On this day in 1976 - August 22nd - The Soviet Luna 24 returned soil samples from the Moon.

These samples were different from the previous ones because they were collected from 2.5 meters below the surface.




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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929628 08/26/18 10:02 AM
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On this day in 1966 - August 23rd - NASA's Lunar Orbiter 1 took the first picture of the Earth ever taken from the Moon.

The spacecraft's primary mission was to photograph smooth areas of the lunar surface for selection and verification of safe landing sites for the Surveyor and Apollo missions.


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Re: 2018: On this day . . . [Re: Mona - Astronomy] #929645 08/27/18 08:11 AM
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On this day in 2003 - August 25th - NASA's Spitzer Space Telescope was launched.

Spitzer is an infrared telescope. Although it lost much of its capability in 2009 when the coolant ran out, one instrument is still functioning and providing valuable data.



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