Talk:Extremely large telescope

Comments
This article needs a reference for the claim that "An extremely large telescope is a telescope of more than 20m diameter". Thue | talk 20:55, 13 December 2006 (UTC)

Amendments to the lead, diameter and bigger than ELTs
"Telescopes for other wavelengths can be much bigger..." Since the cited sources define the aperture of an ELT in the range of 20m to 100m, (and I amended the lead accordingly after adding an alternative URL to the previously removed source), it seemed confusing to mention the 100m-Green Bank Telescope as an example for a much bigger telescope. Instead, I replaced it with the Arecibo Observatory. In addition, I changed the above statement to "Telescopes for radio wavelengths can be much bigger", since they are all radio telescopes (please verify) -- Cheers,  R fassbind  -talk   19:02, 10 May 2015 (UTC)

Move discussion in progress
There is a move discussion in progress on Talk:European Extremely Large Telescope which affects this page. Please participate on that page and not in this talk page section. Thank you. —RMCD bot 09:45, 21 April 2017 (UTC)


 * The renaming is official. I wonder if we can move this article to Extremely large telescopes as it describes a class of objects. --mfb (talk) 14:26, 14 June 2017 (UTC)

External links modified
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 * Added archive https://web.archive.org/web/20080310010642/http://medusa.as.arizona.edu/lbto/firstbinocularlight_press_release.htm to http://medusa.as.arizona.edu/lbto/firstbinocularlight_press_release.htm
 * Added archive https://web.archive.org/web/20061019105956/http://www.aura-nio.noao.edu/ to http://www.aura-nio.noao.edu/
 * Added archive https://web.archive.org/web/20090502050342/http://www.hia-iha.nrc-cnrc.gc.ca/VLOT/ to http://www.hia-iha.nrc-cnrc.gc.ca/VLOT/
 * Added archive https://web.archive.org/web/20061214083436/http://www.astro.lu.se/~torben/euro50/ to http://www.astro.lu.se/~torben/euro50/
 * Added archive https://web.archive.org/web/20061123185947/http://serweb.oamp.fr/denis/elt/ngcfht_may01.html to http://serweb.oamp.fr/denis/elt/ngcfht_may01.html
 * Added tag to http://optik2.mtk.nao.ac.jp/futureplan/eltproje.htm
 * Added archive https://web.archive.org/web/20020605200532/http://celt.ucolick.org/ to http://celt.ucolick.org/
 * Added archive https://web.archive.org/web/20060825102344/http://www.aao.gov.au/instrum/ELT/Workshop/ to http://www.aao.gov.au/instrum/ELT/Workshop/
 * Added archive https://web.archive.org/web/20120213001211/http://www.roe.ac.uk/ukatc/projects/elt/ to http://www.roe.ac.uk/ukatc/projects/elt/

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 * Looking for more recent versions of the web pages would be ideal, but for now at least we have archived versions. --mfb (talk) 15:59, 26 September 2017 (UTC)

External links modified (January 2018)
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Colossus
This seems like nothing more than a technology suggestion by a small group of developers. I didn't find on the internet any hint that it is even considered for budgeting. All references are from colossus.com. For now I'm removing this section for relevance reasons. 217.132.48.168 (talk) 18:51, 21 September 2018 (UTC)
 * My initial opinion is that the removal makes sense. And, if further supporting sources are found, then the section can always be reinstated with with the new information. Senator2029 “Talk” 22:08, 21 September 2018 (UTC)

Meaning of the rank and colors in the table?
The table is sorted in a sensible order, from biggest to smallest, but the rank column of the table goes in the opposite order, from 5 for the biggest telescope to 1 for the smallest one, which is confusing. Also, the two last rows have different colors than the others. What is the meaning of this color? Amaurea (talk) 21:38, 28 September 2019 (UTC)
 * I swapped the number ordering. I suspect that the numbers were by time of first light when they were added, but that changed since then. The last two have a color because they are just there for comparison with existing telescopes. With their size they are not extremely large telescopes. Not sure why they have two colors instead of just one. It was changed in 2014 without edit comment. --mfb (talk) 23:03, 28 September 2019 (UTC)

Alternative artist's rendering with guide stars
Instead of File:Artist’s rendering of the ELT in operation.jpg in the stills section, would http://www.eso.org/public/products/calendars/cal202208/ be better? I think it's CC-BY 4.0. Cheers, cm&#610;&#671;ee&#9094;&#964;a&#671;&#954; 00:15, 31 October 2021 (UTC)