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.
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).
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?
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 :)
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.
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.
22 comments
[ 2.7 ms ] story [ 30.3 ms ] threadhttps://trends.google.com/trends/explore?q=tranche
https://xkcd.com/1053/
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-...
The “non-quick” Data Release 1 is planned for October 2026: https://euclid.caltech.edu/page/data-release-timeline
- "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”
- "It'll have to go"
:)