• 5 Posts
  • 28 Comments
Joined 1 year ago
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Cake day: June 13th, 2023

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  • As far as we’re aware, dark matter only interacts with the universe gravitationally. It doesn’t even interact with itself, which is why we don’t see dark planets/stars/galaxies popping into existence. It only follows normal matter around.

    As for why it’s not called cold, is for two reasons:

    1. Cold gases of normal matter can condense to form stars. Dark matter doesn’t interact with itself, which implies it cannot condense into more concentrated forms of itself the way a gas cloud can eventually form a star.
    2. We just don’t know what the stuff is, it could be clouds, planets, black holes, neutron stars, brown dwarfs, etc. But our best observations of dark matter are from very large distances away where we can measure the distortion of spacetime due to dark matter. We can’t see these smaller objects at these distances. But we should be able to see other clues that would indicate it’s normal matter.

    If it happened to be clouds of gas and dust that overall had a net gravitational effect on the background galaxies, we’d be able to detect the spectral lines of these clouds. Same for just about all the other objects in that list. In some cases we do detect intergalactic gas clouds. But in places where there’s very clearly unaccounted for gravitational lensing, there isn’t any sign of this. So far the only things we can match up to the observations is a mathematical model of the stuff.




  • From a technical standpoint, I can’t see media-heavy social media in the format of Facebook lasting too long in a federated environment considering the costs involved to maintain the server instance. Trying to do that while being free is absolutely unsustainable. Another shift in resource management would have to happen before platforms like that would be inexpensive and scalable.

    Currently, Lemmy instances are slowly and steadily growing with each user interaction within, and between instances. Most shared content is link aggregation meaning minimal server resources. But resource usage goes up much faster when images, or even videos are uploaded to be shared. This format will only grow more expensive over time, and definitely won’t last in the current format.




  • Oh hey you added in the comment stuff! It’s great for an initial release, though it definitely does need some refinement to be easily useable.

    • Comment feature buttons
      • They mostly work well, and look great! But tapping a comment does push the entire comment down as the buttons on top appear. Versus the ideal behavior of the comment position remaining absolute, and the buttons appear relative to it
      • Also, on narrow screens, the Next button does get pushed off a little bit
    • Done
      • Functions as expected, hides the extra buttons from the active comment
    • Hide
      • Correctly hides the comment when tapped
    • Show
      • This shouldn’t need to exist, as tapping on a hidden comment should automatically show it
    • Prev
      • Correctly activates the previous top comment, and shows the selected comment features. UI moves the selected comment just off-screen, so you have to scroll down some more to see it, even if it was already on-screen
    • Next
      • Same issues as the Prev button, comment selection is correct, but off-screen