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PostPosted: Mon May 10, 2021 6:25 pm
 




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PostPosted: Tue May 11, 2021 12:42 pm
 


$1:
Space telescope's golden mirror wings open one last time on Earth

Image

For the last time while it is on Earth, the world's largest and most powerful space science telescope opened its iconic primary mirror. This event marked a key milestone in preparing the observatory for launch later this year.

As part of the NASA's James Webb Space Telescope's final tests, the 6.5-meter (21-foot, 4-inch) mirror was commanded to fully expand and lock itself into place, just like it would in space. The conclusion of this test represents the team's final checkpoint in a long series of tests designed to ensure Webb's 18 hexagonal mirrors are prepared for a long journey in space, and a life of profound discovery. After this, all of Webb's many movable parts will have confirmed in testing that they can perform their intended operations after being exposed to the expected launch environment.

"The primary mirror is a technological marvel. The lightweight mirrors, coatings, actuators and mechanisms, electronics and thermal blankets when fully deployed form a single precise mirror that is truly remarkable," said Lee Feinberg, optical telescope element manager for Webb at NASA's Goddard Space Flight Center in Greenbelt, Maryland. "This is not just the final deployment test sequence that the team has pulled off to prepare Webb for a life in space, but it means when we finish, that the primary mirror will be locked in place for launch. It's humbling to think about the hundreds of dedicated people across the entire country who worked so hard to design and build the primary mirror, and now to know launch is so close."



https://phys.org/news/2021-05-space-tel ... wings.html


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PostPosted: Fri May 14, 2021 2:25 pm
 




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PostPosted: Fri May 14, 2021 11:38 pm
 


$1:
There are traces of the sun, deep within our Earth's core.

Researchers at Heidelberg University in Germany have found evidence of particles from solar winds that were encased within the Earth's core over 4.5 billion years ago.

https://www.ctvnews.ca/sci-tech/study-f ... -1.5429157


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PostPosted: Fri May 14, 2021 11:47 pm
 




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PostPosted: Sat May 15, 2021 1:11 pm
 




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PostPosted: Tue May 18, 2021 7:39 pm
 




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PostPosted: Wed May 19, 2021 3:36 pm
 




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PostPosted: Wed May 19, 2021 3:37 pm
 




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PostPosted: Thu May 20, 2021 8:45 pm
 




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PostPosted: Mon May 24, 2021 12:35 pm
 




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PostPosted: Mon May 24, 2021 4:20 pm
 




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PostPosted: Mon May 24, 2021 6:49 pm
 


Why? The ISS is awesome. No need to replace it.

-J.


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PostPosted: Tue May 25, 2021 6:25 am
 


CDN_PATRIOT CDN_PATRIOT:
Why? The ISS is awesome. No need to replace it.

-J.


The station goes through day/night cycles every 45 minutes. It has thrusters that raise its orbit periodically.

All of that leads to metal fatigue. Eventually the station will leak air, and become irreparable, and need to be replaced.


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PostPosted: Tue May 25, 2021 6:39 am
 


$1:
Metals found in the atmospheres of comets in and beyond our solar system surprise scientists

Metal atoms have surprisingly been discovered in the frigid atmosphere of the first known interstellar comet to visit our solar system, a new study finds.

Astronomers have also detected metal in the cold haloes surrounding comets local to the solar system, which suggest our solar system comets and the interstellar visitor may have similar origins, researchers add.

Comets, which are made up of dust and ice left over from planetary formation, could yield key clues to the chemistry of early planetary systems. Scientists often deduce the composition of comets by examining the clouds of gas and dust known as comas that surround the hearts of comets.

Scientists typically do not detect metals such as nickel in the comas of comets, since their surfaces are usually too cold for metal to vaporize. Exceptions to this rule are comets passing near or plunging into the sun, when temperatures can readily exceed the 800 degrees Fahrenheit (425 degrees Celsius) needed for nickel vapor to form.

Now scientists have detected nickel atoms in the coma of the first known interstellar comet, 2I/Borisov. First discovered in 2019, its speed and trajectory revealed it was a rogue comet from interstellar space, making it the first known interstellar comet and the second known interstellar visitor after the pancake-shaped shape rock 1I/'Oumuamua.

The discovery was unexpected — when astronomers first saw these nickel atoms in January using the Very Large Telescope in Chile, 2I/Borisov was far from the sun, with an estimated temperature of minus 135 degrees F (minus 93 degrees C). They detailed their findings in the May 20 issue of the journal Nature.


https://www.space.com/metals-detected-i ... tmospheres


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