James Webb Space Telescope, information, updates and discussion |
James Webb Space Telescope, information, updates and discussion |
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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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#2
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 4252 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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#3
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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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Lo-Fi Version | Time is now: 23rd June 2024 - 03:57 AM |
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