oce 🐆

I try to contribute to things getting better, with sourced information, OC and polite rational skepticism.
Disagreeing with a point ≠ supporting the opposite side, I support rationality.
Let’s discuss to make things better sustainably.
Always happy to question our beliefs.

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Joined 2 years ago
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Cake day: July 7th, 2023

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  • I was surprised so I did the computation just to resolve the disk of Betelgeuse at 550 nm, and I found a telescope of 2.8 m, that’s definitely already doable. We already have 8 m in one piece and 10 m segmented, JWST is 6.5 m segmented. The ELT is planned to be 39 m for 2028. So this star is closer and bigger than I thought.

    And these are the images we have from one of the top imaging instrument SPHERE on the VLT in 2019. It’s precise enough to show the change of shape due to its variable star type.


  • It would be the size of the telescope’s diffraction artifacts probably. Meaning the shape you see on the picture is not related to the size of the star but only to the physical limits of the optical instrument. This diffraction pattern is proportional to the color your looking at and inversely proportional to the size of the telescope primary mirror. The bigger the telescope primary mirror, the smaller the diffraction pattern and the more chance you have that this artifact will not completely hide the object you are looking at. I didn’t do the math, but I guess to image the actual disk of Betelgeuse, the size of the telescope you need is probably still science fiction, even with interferometry.












  • Non, on savait déjà faire des simulations précises de l’efficacité de nos armes nucléaires.

    Je ne trouve pas où cela est confirmé dans le rapport. Ils disent que le programme de simulation a été lancé en 1995, puis tous les programmes mentionnés sont post 2005.
    Ayant étudié la physique et travaillant dans l’informatique, j’ai des doutes que des simulations informatiques dans les années 90 aient pu produire beaucoup de résultats pertinents.

    En outre, en science en général, on essaye toujours de comparer le résultat du modèle informatique qui est inévitablement une simplification de la théorie, avec des observations de la réalité pour s’assurer que la théorie ou le modèle ne créé pas des résultats imaginaires.
    Donc d’un point de vue purement recherche physique, ça semble raisonnable de nécessiter des expériences réelles pour encadrer les simulations informatiques.
    En considérant l’impact environnemental, je ne dis pas que ça vallait le coup.

    C’est d’ailleurs une des raisons principales du développement du Laser Mégajoule par le CEA en ce moment, c’est une expérience qui permet de continuer à observer la physique de haute énergie sans faire exploser de bombe nucléaire. En espérant que ça aura des retomber scientifiques sur d’autres domaines utiles à la société, comme la recherche en physique nucléaire en a déjà beaucoup.



  • Do you realize you are using similar arguments as the far right / masculinist by mentioning nerds, losers, mockery, charisma, soft boys, soy drinkers, display of power?

    I said before I’m considering those who may still listen and the next generation. I know you can’t change the current maga-like with public education.


  • oce 🐆@jlai.lutoMicroblog Memes@lemmy.worldAOC on bluesky
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    9 days ago

    You have to compete with the content they produce regardless.

    No, you can educate people from the start so they are able to weed out information by themselves.
    Isn’t it what you do? You are educated so you are able to detect the far right bullshit.
    Or are you really watching a bigger amount of content that ridicule this view in order to counter its effect?






  • The first step toward meaningful change begins with us. We must abandon our craving for glossy (and therefore glassy) devices, and instead embrace hardware that may not be as immediately pleasing to the eye (as it is the case with e.g. Fairphones or the PinePhone), but is built to be slightly more durable, somewhat repairable, and capable of outlasting even today’s limited commitments to software updates.

    Fairphone and PinePhone being only mentioned anecdotally for being too pretty, and I guess not as sturdy as the author wants, is quite weird for an article about reducing fragility and improving repairability.


  • oce 🐆@jlai.lutoMicroblog Memes@lemmy.worldAOC on bluesky
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    9 days ago

    I’m skeptical about how efficient that could be. Are you going to compete with how much content they are able to produce to ridicule it? I feel like there’s some Brandolini’s-like law at play here.
    What should I see about teenagers? Last I heard, masculinism is growing among them.