4 ms·

Euclid opens data treasure trove, offers glimpse of deep fields

107 points by layer8 2y ago

dylan604 2y ago
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 2y ago
  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 2y ago
Euclid is such a cool mission and this first tranche is merely 0.4% of what we'll eventually be getting. Fingers crossed!
- bongodongobob 2y ago
  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 2y ago
    https://en.wikipedia.org/wiki/Frequency_illusion https://en.wikipedia.org/wiki/Frequency_illusion
    - tslater2006 2y ago
      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 2y ago
        I’ve been hearing everyone talking about this phenomenon. Is it trending now?
  - perihelions 2y ago
    It's not, https://trends.google.com/trends/explore?q=tranche https://trends.google.com/trends/explore?q=tranche https://xkcd.com/1053/ https://xkcd.com/1053/
    - bongodongobob 2y ago
      Well it's trending where I work, that's why I asked. I can search Teams and it doesn't come up at all, until the last month. Bam, tranche this and that instead of "group", which has been normal for 40 some years.
  - deleted 2y ago
    [deleted]
  - jiggawatts 2y ago
    I started noticing it around the 2008/9 financial crisis because CDOs have tranches.
  - Tepix 2y ago
    It‘s a normal word in German but i‘ve seen it used by ESA in English in the context of this data release.
perihelions 2y ago
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 https://en.wikipedia.org/wiki/List_of_deep_fields [b] https://www.aanda.org/articles/aa/full_html/2025/03/aa51857-24/aa51857-24.html https://www.aanda.org/articles/aa/full_html/2025/03/aa51857-... [c] https://www.aanda.org/articles/aa/full_html/2017/12/aa30833-17/aa30833-17.html https://www.aanda.org/articles/aa/full_html/2017/12/aa30833-...
- layer8 2y ago
  See here: https://www.esa.int/Science_Exploration/Space_Science/Euclid/Frequently_asked_questions_about_Euclid https://www.esa.int/Science_Exploration/Space_Science/Euclid... and here: https://bigthink.com/starts-with-a-bang/euclid-science-images-jwst/ https://bigthink.com/starts-with-a-bang/euclid-science-image...
nimish 2y ago
Hopefully this is raw. Too much data is hidden behind obfuscated layers of "corrections"
- moi2388 2y ago
  Indeed. Was wanting to do some own analysis but realised all data I could find was ‘corrected’ :(
  - nimish 2y ago
    many such cases
- layer8 2y ago
  This is the Q1 data release: https://www.cosmos.esa.int/web/euclid/euclid-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_etal.pdf 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 https://euclid.caltech.edu/page/data-release-timeline
- whatshisface 2y ago
  When you are dealing with instrumentation, it is the device characteristics that obfuscate the signal and the calibrations that de-obsfucate it.
  - nimish 2y ago
    Who calibrates the calibrations?
NKosmatos 2y ago
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”
- TuringTourist 2y ago
  And a follow up from the Krikkit species from the Hitchhiker's Guide: - "It'll have to go" :)

107 points by layer8 2y ago

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 2y ago
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 2y ago

Euclid is such a cool mission and this first tranche is merely 0.4% of what we'll eventually be getting. Fingers crossed!

bongodongobob 2y ago
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 2y ago
  https://en.wikipedia.org/wiki/Frequency_illusion https://en.wikipedia.org/wiki/Frequency_illusion
  - tslater2006 2y ago
    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 2y ago
      I’ve been hearing everyone talking about this phenomenon. Is it trending now?
- perihelions 2y ago
  It's not, https://trends.google.com/trends/explore?q=tranche https://trends.google.com/trends/explore?q=tranche https://xkcd.com/1053/ https://xkcd.com/1053/
  - bongodongobob 2y ago
    Well it's trending where I work, that's why I asked. I can search Teams and it doesn't come up at all, until the last month. Bam, tranche this and that instead of "group", which has been normal for 40 some years.
- deleted 2y ago
  [deleted]
- jiggawatts 2y ago
  I started noticing it around the 2008/9 financial crisis because CDOs have tranches.
- Tepix 2y ago
  It‘s a normal word in German but i‘ve seen it used by ESA in English in the context of this data release.

perihelions 2y ago

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 https://en.wikipedia.org/wiki/List_of_deep_fields [b] https://www.aanda.org/articles/aa/full_html/2025/03/aa51857-24/aa51857-24.html https://www.aanda.org/articles/aa/full_html/2025/03/aa51857-... [c] https://www.aanda.org/articles/aa/full_html/2017/12/aa30833-17/aa30833-17.html https://www.aanda.org/articles/aa/full_html/2017/12/aa30833-...

layer8 2y ago
See here: https://www.esa.int/Science_Exploration/Space_Science/Euclid/Frequently_asked_questions_about_Euclid https://www.esa.int/Science_Exploration/Space_Science/Euclid... and here: https://bigthink.com/starts-with-a-bang/euclid-science-images-jwst/ https://bigthink.com/starts-with-a-bang/euclid-science-image...

nimish 2y ago

Hopefully this is raw. Too much data is hidden behind obfuscated layers of "corrections"

moi2388 2y ago
Indeed. Was wanting to do some own analysis but realised all data I could find was ‘corrected’ :(
- nimish 2y ago
  many such cases
layer8 2y ago
This is the Q1 data release: https://www.cosmos.esa.int/web/euclid/euclid-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_etal.pdf 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 https://euclid.caltech.edu/page/data-release-timeline
whatshisface 2y ago
When you are dealing with instrumentation, it is the device characteristics that obfuscate the signal and the calibrations that de-obsfucate it.
- nimish 2y ago
  Who calibrates the calibrations?

NKosmatos 2y ago

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”

TuringTourist 2y ago
And a follow up from the Krikkit species from the Hitchhiker's Guide: - "It'll have to go" :)