[HN Gopher] Euclid opens data treasure trove, offers glimpse of ...
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Euclid opens data treasure trove, offers glimpse of deep fields
Author : layer8
Score : 70 points
Date : 2025-03-20 17:07 UTC (3 days ago)
(HTM) web link (www.esa.int)
(TXT) w3m dump (www.esa.int)
| dylan604 wrote:
| In these videos zooming through the universe, is it just an
| optical illusion that seems to give a sense of depth and parallax
| motion, or is it something they've deliberately done to achieve
| it? I love the effect's subtlety and much less Ken Burns effect
| of making 2.5D in your face.
| layer8 wrote:
| It's an optical illusion. Probably because the human eye tries
| to interpret stars/galaxies of different brightness classes as
| sitting on different layers, and the speed perception is
| influenced by brightness (dimmer stars may slightly lag behind
| in human perception). It's likely reinforced by the fact that
| the speed on the "canvas" isn't uniform (the dots move faster
| the farer away they are from the center).
| Tepix wrote:
| Euclid is such a cool mission and this first tranche is merely
| 0.4% of what we'll eventually be getting. Fingers crossed!
| bongodongobob wrote:
| Where did you hear the word tranche? People at work just
| started using it recently and I've been seeing it more as well.
| Why is this word trending right now?
| n3t wrote:
| https://en.wikipedia.org/wiki/Frequency_illusion
| tslater2006 wrote:
| Heh, was looking up the wiki on the Baader Meinhoff
| phenomenon only to find out it sends you to your link.
| Guess that's an easier name to know it as :)
| vlovich123 wrote:
| I've been hearing everyone talking about this phenomenon.
| Is it trending now?
| perihelions wrote:
| It's not,
|
| https://trends.google.com/trends/explore?q=tranche
|
| https://xkcd.com/1053/
| jiggawatts wrote:
| I started noticing it around the 2008/9 financial crisis
| because CDOs have tranches.
| perihelions wrote:
| How do these deep fields compare against other telescopes' deep
| fields (Hubble, JWST, &c.)?
|
| edit: Trying to answer my own question: I understand they're
| around 10,000 times larger that Hubble's deep fields, each (three
| deep field zones)[a], with about 1/10th the sensitivity (limiting
| magnitude +27 in the optical bands[b], compared against Hubble's
| +29.1-30.3 [c]). Or that's the sensitivity it _will_ reach,
| eventually; the one they 've released now is still incomplete.
|
| [a] https://en.wikipedia.org/wiki/List_of_deep_fields
|
| [b]
| https://www.aanda.org/articles/aa/full_html/2025/03/aa51857-...
|
| [c]
| https://www.aanda.org/articles/aa/full_html/2017/12/aa30833-...
| layer8 wrote:
| See here:
| https://www.esa.int/Science_Exploration/Space_Science/Euclid...
| and here: https://bigthink.com/starts-with-a-bang/euclid-
| science-image...
| nimish wrote:
| Hopefully this is raw. Too much data is hidden behind obfuscated
| layers of "corrections"
| moi2388 wrote:
| Indeed. Was wanting to do some own analysis but realised all
| data I could find was 'corrected' :(
| layer8 wrote:
| This is the Q1 data release:
| https://www.cosmos.esa.int/web/euclid/euclid-q1-data-release
| This paper gives an overview: https://pubs.euclid-
| ec.org/public/coordinated_release/aussel... See figure 4 for an
| overview of the data processing.
|
| The "non-quick" Data Release 1 is planned for October 2026:
| https://euclid.caltech.edu/page/data-release-timeline
| NKosmatos wrote:
| While reading this announcement, two phrases came to my mind:
|
| - "The sky! It's full of... stars!" from Isaac Asimov's short
| story "Nightfall"
|
| - "My God, it's full of stars!" from Arthur C Clarke's novel
| "2001: A Space Odyssey"
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