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28 Mar 2024, 10:53 [ UTC - 5; DST ]


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 Post subject: Re: James Web Telescope
PostPosted: 21 Apr 2022, 17:53 
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Yes, we've had presumed squirrels take down the accelerator complex at least twice while I've been here. I say "presumed" it because when a squirrel gets across a 50MW feeder, you pretty much need DNA analysis to tell what it was originally.

Our best site take down was by an ant. It somehow (???) got into the source laser room, climbed onto the Ti:Sapphire laser crystal and got evaporated onto the surface- which then absorbed enough power to destroy the crystal - shutting down the entire $1B facility for several hours.


Username Protected wrote:
From your perspective, how susceptible is our electric power distribution network to EMP?

Probably no worse than squirrels:

https://en.wikipedia.org/wiki/Electrica ... _squirrels

"John C. Inglis, the former deputy director of the U.S. National Security Agency, said in 2015 that he judged the electrical grid was as likely to be paralyzed by a natural disaster as by a cyberattack and added: "[F]rankly, the No. 1 threat experienced to date by the U.S. electrical grid is squirrels."

Mike C.


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 Post subject: Re: James Web Telescope
PostPosted: 21 Apr 2022, 21:37 
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Username Protected wrote:
Our best site take down was by an ant. It somehow (???) got into the source laser room, climbed onto the Ti:Sapphire laser crystal and got evaporated onto the surface- which then absorbed enough power to destroy the crystal - shutting down the entire $1B facility for several hours.

https://getyarn.io/yarn-clip/9736bda0-6204-4fbe-a659-d1d63a6cbb05
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53F685AF-E362-4AF6-B8A1-09FA388B9F32.jpeg


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 Post subject: Re: James Web Telescope
PostPosted: 11 May 2022, 13:18 
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Alignment complete - NASA Releases Ridiculously Sharp Webb Space Telescope Images

https://gizmodo.com/webb-telescope-shar ... 1848899825

“I’m delighted to report that the telescope alignment has been completed with performance even better than we had anticipated,” said Michael McElwain, a Webb observatory project scientist at NASA’s Goddard Space Flight Center, in a NASA press conference. “This is an extraordinary milestone for humanity.”

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 Post subject: Re: James Web Telescope
PostPosted: 11 Jul 2022, 09:17 
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First Images from the James Webb Space Telescope

NASA, in partnership with ESA (European Space Agency) and CSA (Canadian Space Agency), will release the James Webb Space Telescope’s first full-color images and spectroscopic data during a televised broadcast beginning at 10:30 a.m. EDT (14:30 UTC) on Tuesday, July 12, from NASA’s Goddard Space Flight Center in Greenbelt, Maryland.

Released one by one, these first images from the world’s largest and most powerful space telescope will demonstrate Webb at its full power, ready to begin its mission to unfold the infrared universe.

On Monday, July 11 at 5 p.m. EDT, President Joe Biden will release one of Webb’s first images in a preview event at the White House in Washington. NASA Administrator Bill Nelson will provide remarks. A live stream of the event will be available on NASA TV.

Each image will simultaneously be made available on social media as well as on the agency’s website on this page.

Embargoed access to Webb’s first images will not be available prior to their public release.

Read the full advisory on the release of the first images from the James Webb Space Telescope.

For more about Webb’s current status, visit the “Where Is Webb?” tracker.


https://www.nasa.gov/webbfirstimages


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 Post subject: Re: James Web Telescope
PostPosted: 11 Jul 2022, 15:21 
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image leaked prematurely

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 Post subject: Re: James Web Telescope
PostPosted: 11 Jul 2022, 18:28 
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And the big preliminary reveal

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 Post subject: Re: James Web Telescope
PostPosted: 11 Jul 2022, 18:48 
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The images, in full resolution:

https://webbtelescope.org/contents/medi ... CYAHBXKSD1

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 Post subject: Re: James Web Telescope
PostPosted: 11 Jul 2022, 19:18 
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As posted somewhere else, here's a GIF contrasting this image with an image from Hubble of the same area. The Hubble one needed a two week exposure!

https://i.redd.it/9uyhwijeo0b91.gif


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 Post subject: Re: James Web Telescope
PostPosted: 11 Jul 2022, 19:36 
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Username Protected wrote:
As posted somewhere else, here's a GIF contrasting this image with an image from Hubble of the same area. The Hubble one needed a two week exposure!

https://i.redd.it/9uyhwijeo0b91.gif

That comparison is a little misleading since the average intensity from the JWST image is much higher. The real significant differences are the finer detail and much greater number of stars from the JW and of course the radically different exposure times.

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 Post subject: Re: James Web Telescope
PostPosted: 11 Jul 2022, 21:16 
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And the big preliminary reveal

Attachment:
45387B85-9F82-4EDF-9D6F-6812EDED6692.jpeg


Here's a description from NASA.

The image shows the galaxy cluster SMACS 0723 as it appeared 4.6 billion years ago. The combined mass of this galaxy cluster acts as a gravitational lens, magnifying much more distant galaxies behind it. Webb’s NIRCam has brought those distant galaxies into sharp focus – they have tiny, faint structures that have never been seen before, including star clusters and diffuse features. Researchers will soon begin to learn more about the galaxies’ masses, ages, histories, and compositions, as Webb seeks the earliest galaxies in the universe.


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 Post subject: Re: James Web Telescope
PostPosted: 11 Jul 2022, 21:22 
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Username Protected wrote:
And the big preliminary reveal

Attachment:
45387B85-9F82-4EDF-9D6F-6812EDED6692.jpeg


Here's a description from NASA.

The image shows the galaxy cluster SMACS 0723 as it appeared 4.6 billion years ago. The combined mass of this galaxy cluster acts as a gravitational lens, magnifying much more distant galaxies behind it. Webb’s NIRCam has brought those distant galaxies into sharp focus – they have tiny, faint structures that have never been seen before, including star clusters and diffuse features. Researchers will soon begin to learn more about the galaxies’ masses, ages, histories, and compositions, as Webb seeks the earliest galaxies in the universe.


I understand some of those words.
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 Post subject: Re: James Web Telescope
PostPosted: 11 Jul 2022, 22:03 
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The real significant differences are the finer detail and much greater number of stars from the JW

The thing is they’re not stars, most of them are galaxies filled with stars. Kinda blows your mind.

We are very small.

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 Post subject: Re: James Web Telescope
PostPosted: 11 Jul 2022, 22:31 
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The funny curved red galaxies, are mostly normal - but the mass of the cluster of galaxies in front of them has bend their light into arcs. You can tell they are distant because they are red colored. In this image, its a pretty good guess that the redder something is, the further away it is. (due to cosmological read shift - eg its nearer the edge of the universe so its expanding away from us faster than near thigns are).

Its a fantastic picture.


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 Post subject: Re: James Web Telescope
PostPosted: 12 Jul 2022, 06:52 
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Anyone else subscribe to the word of the day from the OED? This popped up today.

If you're enjoying this thread you are an...

astrophile, n.
[‘A lover of the stars; a person who is interested in astronomy as an amateur or non-expert. Also figurative.’]
Pronunciation: Brit. /ˈastrəfʌɪl/, U.S. /ˈæstrəˌfaɪl/
Forms: 1600s– astrophile, 1600s 1900s– astrophil, 1700s astrophyle.
Origin: Formed within English, by compounding; modelled on a French lexical item. Etymons: ASTRO- comb. form, -PHILE comb. form.
Etymology: < ASTRO- comb. form + -PHILE comb. form, after French astrophile (1552 in Middle French in Rabelais).
Now chiefly historical.
A lover of the stars; a person who is interested in astronomy as an amateur or non-expert. Also figurative.
1631 J. BOOKER(title) A new almanack and prognostication for the yeare of our Lord God, 1631... By Iohn Bowker, astrophile.

https://public.oed.com/updates/


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 Post subject: Re: James Web Telescope
PostPosted: 12 Jul 2022, 08:57 
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Username Protected wrote:
The real significant differences are the finer detail and much greater number of stars from the JW

The thing is they’re not stars, most of them are galaxies filled with stars. Kinda blows your mind.

We are very small.


Exactly, this helps a little with the scale of this

[youtube]https://youtu.be/p1mObQX7NN8[/youtube]

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