APOD : Telescopes and Spectra
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Linkage : APOD: 2022 July 18 - Stephans Quintet from Webb, Hubble, and Subaru[^]. That's the APOD from Monday, the 18th. What I found most interesting about it is the text where it describes how the Hubble and Webb telescopes are sensitive to different bandwidths of light. The effect is really cool when images from them are combined. PS - today's image is pretty cool too. Be sure to check it out.
"They have a consciousness, they have a life, they have a soul! Damn you! Let the rabbits wear glasses! Save our brothers! Can I get an amen?"
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Linkage : APOD: 2022 July 18 - Stephans Quintet from Webb, Hubble, and Subaru[^]. That's the APOD from Monday, the 18th. What I found most interesting about it is the text where it describes how the Hubble and Webb telescopes are sensitive to different bandwidths of light. The effect is really cool when images from them are combined. PS - today's image is pretty cool too. Be sure to check it out.
"They have a consciousness, they have a life, they have a soul! Damn you! Let the rabbits wear glasses! Save our brothers! Can I get an amen?"
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Looks like the Hubble imaged Stephan's Quintet around "July/August, 2009". And Subaru took it's image around the same time on "2009-05-25". So there is around 12 years between those and the Webb image. I wonder how that affects the composite image.
Given the distances involved - I doubt that you could notice any difference. Given a star moving transverse to the line of sight at the speed of light, its angular movement would be 12/290,000,000 radians, or 0.009 seconds of arc. As stars typically move at a dmall fraction of the speed of light, the difference would be immeasurable.
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows. -- 6079 Smith W.
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Given the distances involved - I doubt that you could notice any difference. Given a star moving transverse to the line of sight at the speed of light, its angular movement would be 12/290,000,000 radians, or 0.009 seconds of arc. As stars typically move at a dmall fraction of the speed of light, the difference would be immeasurable.
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows. -- 6079 Smith W.
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Linkage : APOD: 2022 July 18 - Stephans Quintet from Webb, Hubble, and Subaru[^]. That's the APOD from Monday, the 18th. What I found most interesting about it is the text where it describes how the Hubble and Webb telescopes are sensitive to different bandwidths of light. The effect is really cool when images from them are combined. PS - today's image is pretty cool too. Be sure to check it out.
"They have a consciousness, they have a life, they have a soul! Damn you! Let the rabbits wear glasses! Save our brothers! Can I get an amen?"
Not sure whether we'll get such good pictures in future from Webb. JWST picture shows noticeable damage from micrometeoroid strike | Space[^]
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Yeah, but I'm wondering about brightness difference[^], not motion across the sky. There's alot of dust in there, I wonder how it affects the composite image.
Given that the "window" for each telescope partly overlaps that of another, I would assume that they adjusted the brightnesses of the overlapping parts so that they matched. While individual stars' brightness can vary, I doubt that entire galaxies (or significant parts thereof) would vary much in such a short time. You would have to either explain a massive violation of Special Relativity, or propose a mechanism whereby large numbers of stars would independently change their brightness over such a short time.
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows. -- 6079 Smith W.
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Given that the "window" for each telescope partly overlaps that of another, I would assume that they adjusted the brightnesses of the overlapping parts so that they matched. While individual stars' brightness can vary, I doubt that entire galaxies (or significant parts thereof) would vary much in such a short time. You would have to either explain a massive violation of Special Relativity, or propose a mechanism whereby large numbers of stars would independently change their brightness over such a short time.
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows. -- 6079 Smith W.
Stephan's Quintet contains five galaxies. I'm referring to galaxy brightness[^] fluctuations over the last 12 years. I couldn't find any information about how that would be calculated so I gave up. I did find a reference stating that another telescope could only measure galaxy brightness over "one light week" resolution but it was old and seemed to be about another older telescope.
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Linkage : APOD: 2022 July 18 - Stephans Quintet from Webb, Hubble, and Subaru[^]. That's the APOD from Monday, the 18th. What I found most interesting about it is the text where it describes how the Hubble and Webb telescopes are sensitive to different bandwidths of light. The effect is really cool when images from them are combined. PS - today's image is pretty cool too. Be sure to check it out.
"They have a consciousness, they have a life, they have a soul! Damn you! Let the rabbits wear glasses! Save our brothers! Can I get an amen?"
Might find this interesting: Seeing The Universe Like We've Never Seen It Before - YouTube[^]
>64 Some days the dragon wins. Suck it up.