James Webb Space Telescope, information, updates and discussion |
James Webb Space Telescope, information, updates and discussion |
Aug 23 2005, 02:01 PM
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#201
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Member Group: Members Posts: 134 Joined: 13-March 05 Member No.: 191 |
The manufacture of the JWST mirror blanks has now been completed.
Despite this milestone, the fate of JWST is still somewhat precarious, because although the scientific bang from the telescope is expected to be huge, the bucks required have increased to a staggering $4.5 billion. A Space.com article on the squeeze in NASA's space-based astronomy plans gives some background. The JWST home page can be found here. The Space Telescope Science Institute, which runs Hubble, also has a site here. As does ESA. |
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Aug 10 2022, 03:41 PM
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#202
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Senior Member Group: Members Posts: 4256 Joined: 17-January 05 Member No.: 152 |
A good summary of the various caveats for the claims of large, early galaxies in Webb images from S&T.
In short, we need proper spectroscopy and ratios of massive to light stars may differ in the distant past from today, and it'll take time to sort through this. |
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Aug 12 2022, 05:00 PM
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#203
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Member Group: Members Posts: 104 Joined: 3-February 20 From: Paris (France) Member No.: 8747 |
A good summary of the various caveats for the claims of large, early galaxies in Webb images from S&T. In short, we need proper spectroscopy and ratios of massive to light stars may differ in the distant past from today, and it'll take time to sort through this. Bonsoir, (Automatically translated from French) In her blog Stacy Mac Gaugh gives us a new insight into the issue of the advanced redschift tops of many recent papers, which for many, could only turn out to be hasty, often fanciful announcements. Until then, the debate revolved mainly on the validity of the z measurements by the photometric method that gives surprisingly high values to the redshift of relatively massive galaxies. All of this would appear to be a major violation of the standard cosmological model. The "skeptics", and they seem to be quite numerous, ask body and cry, spectra for these objects. This technique applied to the determination of the remoteness of galaxies would lift doubts. While the two methods (photometric shift in red on the one hand and spectroscopy on the other) could potentially give very different results, the JWST itself had not been directly implicated in the controversy. In a "fun" way, it is his remarkable performances that would also be in question... https://tritonstation.com/2022/08/11/by-the-wayside/ |
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Aug 12 2022, 07:03 PM
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#204
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Newbie Group: Members Posts: 14 Joined: 22-August 14 Member No.: 7244 |
Bonsoir, In her blog Stacy Mac Gaugh gives us a new insight into the issue of the advanced redschift tops of many recent papers, which for many, could only turn out to be hasty, often fanciful announcements. Thanks for posting that. In an earlier post titled "JWST Twitter Bender", McGaugh makes the point that MOND predicts more massive galaxies at early cosmological ages than ΛCDM. Stacy McGaugh is a man btw. https://astronomy.case.edu/faculty/stacy-mcgaugh/ |
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