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Posted: 2/14/2020 12:05:20 AM EDT
[#1]
JWST is not primarily a visible-light instrument, it's deep-infrared, for the most part, iirc.
It will have deep implications for our understanding of the cosmos, IMO, but it's more like a radio telescope than an eye-popping optical instrument. I guess the take can be processed to provide visual-wavelength pictures, or estimations thereof. |
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Posted: 2/14/2020 1:01:37 AM EDT
[#2]
Are they EVER going to get the thing up? They will have to get it right the first time too. There won't be any repair missions possible. Have we ever put anything in that high of an orbit?
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Posted: 2/14/2020 12:38:50 PM EDT
[#3]
Quote HistoryQuoted:
Are they EVER going to get the thing up? They will have to get it right the first time too. There won't be any repair missions possible. Have we ever put anything in that high of an orbit? |
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Posted: 2/14/2020 12:44:28 PM EDT
[#4]
Quote HistoryQuoted:
JWST is not primarily a visible-light instrument, it's deep-infrared, for the most part, iirc. It will have deep implications for our understanding of the cosmos, IMO, but it's more like a radio telescope than an eye-popping optical instrument. I guess the take can be processed to provide visual-wavelength pictures, or estimations thereof. But again, I wonder what it is going to see...... If it can see far enough back then it will see all the way back to the beginning, a wall that we can't see past because there was not light in the universe at that point. |
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Posted: 2/17/2020 1:46:47 PM EDT
[#5]
Quote HistoryQuoted: It sees in the IR band like a thermal scope, so in that sense it is very much an optical telescope. Maybe IR butts up to radio in the spectrum but the point it is that it is going to see much further than our current telescopes that are more or less visible light spectrum. But again, I wonder what it is going to see...... If it can see far enough back then it will see all the way back to the beginning, a wall that we can't see past because there was not light in the universe at that point. The Hubble Radius occurs when the item is receding from us at the speed of light. So at that point its light can no longer be seen. It has red shifted to the point of no longer being visible. |
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Posted: 2/29/2020 11:30:54 AM EDT
[#6]
Quote HistoryQuoted: Not exactly. The Hubble Radius occurs when the item is receding from us at the speed of light. So at that point its light can no longer be seen. It has red shifted to the point of no longer being visible. 
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Posted: 2/29/2020 2:24:40 PM EDT
[#7]
Quote HistoryQuoted:
So basically we are not going to see anything new with the webb.....just better detail of what hubble could see.... |
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Posted: 3/1/2020 5:48:53 PM EDT
[#8]
Quote HistoryQuoted:
Deep IR sees through interstellar dust clouds, so we'll also see stuff Hubble couldn't because it was obscured. Quote HistoryQuoted:
Quoted:
So basically we are not going to see anything new with the webb.....just better detail of what hubble could see.... In turn that means we are seeing older and older photons. Deep IR takes a whole other set of tricks compared to visible light. Not the least of which is super cooled sensors. |
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Posted: 7/31/2020 12:08:57 AM EDT
[#9]
I thought JWT will be able to take TESS’ findings and hone in on exoplanets?
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Posted: 8/21/2020 3:15:06 PM EDT
[#10]
Quote HistoryQuoted: I thought JWT will be able to take TESS’ findings and hone in on exoplanets? They better not reverse any lenses Hubble style. |
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Posted: 8/21/2020 4:26:02 PM EDT
[#11]
Quote HistoryQuoted: They better not reverse any lenses Hubble style. Quote HistoryQuoted: Quoted: I thought JWT will be able to take TESS’ findings and hone in on exoplanets? They better not reverse any lenses Hubble style. Yeah I don’t think JWT is fixable |
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Posted: 8/25/2020 3:25:44 PM EDT
[#12]
Quote HistoryQuoted: Yeah I don’t think JWT is fixable Quote HistoryQuoted: Quoted: Quoted: I thought JWT will be able to take TESS’ findings and hone in on exoplanets? They better not reverse any lenses Hubble style. Yeah I don’t think JWT is fixable You can still use optical lenses in IR. The material is not the same. We used to use black nylon to makes optical trains for mm-wave equipment. We told the machinists they were going to be used to create molds. Visitors to our lab always looked at us like we had gone out of our minds. Optical refractors with black nylon lenses. Put your hand over the lens and communications stops. Reflectors are similar. No aluminum film for the mirror surface. High purity gold. |
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Posted: 8/25/2020 6:46:48 PM EDT
[#13]
Quote HistoryQuoted: You can still use optical lenses in IR. The material is not the same. We used to use black nylon to makes optical trains for mm-wave equipment. We told the machinists they were going to be used to create molds. Visitors to our lab always looked at us like we had gone out of our minds. Optical refractors with black nylon lenses. Put your hand over the lens and communications stops. Reflectors are similar. No aluminum film for the mirror surface. High purity gold. Quote HistoryQuoted: Quoted: Quoted: Quoted: I thought JWT will be able to take TESS’ findings and hone in on exoplanets? They better not reverse any lenses Hubble style. Yeah I don’t think JWT is fixable You can still use optical lenses in IR. The material is not the same. We used to use black nylon to makes optical trains for mm-wave equipment. We told the machinists they were going to be used to create molds. Visitors to our lab always looked at us like we had gone out of our minds. Optical refractors with black nylon lenses. Put your hand over the lens and communications stops. Reflectors are similar. No aluminum film for the mirror surface. High purity gold. Nice so the gold on the JWT mirror is pretty thick? |
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Posted: 8/28/2020 4:05:32 PM EDT
[#14]
Quote HistoryQuoted: Nice so the gold on the JWT mirror is pretty thick? It only needs to be thick in relation to the wavelength of the radiation it is trying to image. |
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Posted: 8/28/2020 4:06:19 PM EDT
[#15]
Quote HistoryQuoted: It only needs to be thick in relation to the wavelength of the radiation it is trying to image. Quote HistoryQuoted: Quoted: Nice so the gold on the JWT mirror is pretty thick? It only needs to be thick in relation to the wavelength of the radiation it is trying to image. awesome... |
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Posted: 9/1/2020 3:41:01 PM EDT
[#16]
Quote HistoryQuoted: awesome... Quote HistoryQuoted: Quoted: Quoted: Nice so the gold on the JWT mirror is pretty thick? It only needs to be thick in relation to the wavelength of the radiation it is trying to image. awesome... A layer 3 wavelengths thick is usually adequate. There are some tricks that can be used to use other metals under a thinner gold layer. |
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Posted: 4/12/2021 4:54:39 AM EDT
[#17]
According to the official sources, NASA plans to launch JWST this year in October. If everything goes well, the first scientific data we'll obtain in 2022.
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Posted: 4/12/2021 6:30:41 AM EDT
[#18]
Nothing
It is going to be obsolete before it ever get launched. ESA will fail at getting it to it's very specific LP also. |
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Posted: 6/25/2021 3:34:19 PM EDT
[#19]
Quote HistoryQuoted: Nothing It is going to be obsolete before it ever get launched. ESA will fail at getting it to it's very specific LP also. The obsolete has been a problem in sophisticated satellites for a long time. With a 10 to 15 year design cycle they are almost always "out of date" by the time they get launched. |
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Posted: 6/25/2021 4:12:29 PM EDT
[#20]
Quoted: First light will show???? Another Hubble deep field? another mosaic of thousands of galaxies just further back in time...? Or the beginning of space time....the comic background.....the edge of our universe as it was....?  Attached File |
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Posted: 6/26/2021 6:14:34 PM EDT
[#21]
Quote HistoryQuoted: Quoted: First light will show???? Another Hubble deep field? another mosaic of thousands of galaxies just further back in time...? Or the beginning of space time....the comic background.....the edge of our universe as it was....? Optical : blink out slowly with distance from dust and debris. Also blink out at the Hubble determined by speed of light travel of star away from us. Long IR: penetrates dust and debris better than optical, but Also blink out at the Hubble determined by speed of light travel of star away from us. Radio: Barely affected by fine dust and debris since the wavelength is way longer than any IR. But Also blink out at the Hubble determined by speed of light travel of star away from us since they are still photons of energy. |
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Posted: 7/6/2021 12:41:55 PM EDT
[#22]
I'm betting there is a whole bunch of galaxies between the deep field and the cmb that we will see...
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Posted: 7/27/2021 2:45:30 PM EDT
[#23]
Quote HistoryQuoted: I'm betting there is a whole bunch of galaxies between the deep field and the cmb that we will see... I would agree. The volume of space at enormous distance pales in comparison to what we can see with existing instruments. Even a "relatively" small increase in the radius reveals enormous volumes of space. Compare the volume of the last fraction of a sphere to the volume of the sphere itself. It goes as the cube of the radius. |
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Posted: 2/4/2022 11:39:27 PM EDT
[#24]
This thread deserves a bump
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Posted: 2/6/2022 12:00:43 PM EDT
[#25]
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Posted: 2/12/2022 12:22:32 PM EDT
[#26]
 Damn, thought after hubble they would get JWT right but looks like they put the camera in backwards. Oh well... |
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Posted: 7/25/2022 11:36:45 PM EDT
[#27]
Quote HistoryQuoted: Deep IR takes a whole other set of tricks compared to visible light. Not the least of which is super cooled sensors. ... and super-cold mirrors, too. |
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Posted: 7/25/2022 11:55:08 PM EDT
[#28]
First released images are fucking mind-boggling, if you even know how to appreciate them for what they are.
A generation of new cosmology science or more will come from this investment. |
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Posted: 8/4/2022 10:15:39 PM EDT
[#29]
Quote HistoryQuoted: First released images are fucking mind-boggling, if you even know how to appreciate them for what they are. A generation of new cosmology science or more will come from this investment. The detail and clarity were amazing. Can't wait for the trapist reaults. |
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Posted: 8/4/2022 10:33:26 PM EDT
[#30]
We've already seen more than I expected in the first release. Oldest galaxy observed, water in the atmosphere of an exoplanet, and a better deep field than the Hubble with a 12 hour exposure.
Can't wait for what's in store. Edit: just noticed the date on the OP. 24 page GD thread |
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Posted: 8/13/2022 10:36:02 AM EDT
[#31]
Quote HistoryQuoted: We've already seen more than I expected in the first release. Oldest galaxy observed, water in the atmosphere of an exoplanet, and a better deep field than the Hubble with a 12 hour exposure. Can't wait for what's in store. Edit: just noticed the date on the OP. 24 page GD thread @AJE Yep....been waiting for this for a long time. It is a little disappointing right now that we seem to be getting nothing but higher resolution pics of what hubble hs done. Not sure I'm going to get the OMG moments like we used to get from Hubble. I used to look at the deep field and my mind was blown. Now the things that JW is discovering are nothing but tiny red dots...useful to scientists but not the incredible pics like HGD. The spectra from alien planets will be exciting but again, not the mind blowing pics we are used to. |
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