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Cake day: June 4th, 2023

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  • Yes, ion thrusters still use conservation of momentum to generate thrust. They aren’t limited by how fast or how hot we can make something explode though, so we can shove way more energy into the stuff they’re throwing out the back. They’re basically tiny coil/railguns, using electricity to move individual ions really fast.

    In terms of efficiency, Ion thrusters are 4 to 40 times better than liquid fueled rockets. The draw back is that ion engines make very little thrust for the mass of the engine.







  • I’m pointing out flaws in your reasoning. Bulbous and small aren’t good categories, especially when you recognized that raspberries are different.

    I would contest that the nature of a cultural berry is being a small sweet fruit that typically wants to be eaten. Strawberries sit alongside gooseberries, raspberries, cherries, and all the other traditional berries in this. Strawberries are certainly unique in their structure, but that doesn’t change how we eat them.

    The botanical berry definition has little to do with the cultural definition besides taking the name. Try looking at the botanical definition of tree sometime. Does Bamboo count? Palm trees? Ginkgo? It’s a strategy for than a rigid group.



  • Bayberries/waxberries aren’t really smootth, and Yewberries aren’t very bulbous.

    Haskap berries are lumpy and mealy, are they not berries?

    Do groundcherries count with their paper husk? Tomatillos? Cherry Tomatos?

    Are cherries berries? Rose hips?

    Cherry chili peppers are bulbous and smooth, are they berries?

    Raspberries and blackberries often have little hairs growing off of each fruit, does that mean they’re not smooth? If hair is ok, kiwifruit are bulbous, but hariy.




  • Unfortunately, there’s no way to get energy out of waste heat that won’t be spent pushing that heat a little harder. Already a significant amount of energy is spent cooling data centers, any attempts at energy recapture will just make that cooling harder.

    The best we can do is something like district heating, because heat pumps can get over 100% effective efficiency.



  • Tlaloc_Temporal@lemmy.catoScience Memes@mander.xyzSad Ganymede noises
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    4 months ago

    200+ dwarf planet candidates. Lots of them have very low densities, and most are too far away to know hardly anything about them. Pluto was only confirmed to be in hydrostatic equilibrium with New Horizons, and Quaoar has a Dwarf Planet name, but probably isn’t in hydrostatic equilibrium.

    It’s not the specific bodies I’m worried about, it’s a useful idea of a planet. Finding dozens or hundreds more of them should be exciting, not a reason to throw up our hands and disqualify them.


  • Tlaloc_Temporal@lemmy.catoScience Memes@mander.xyzSad Ganymede noises
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    4 months ago

    I think “Planet” should be a gravitationally rounded mass that’s not a star anyway. Those can be divided into rocky and gaseous, and further divided by principal composition.

    Smaller than that isn’t usually worth having a name, but moons can be just as interesting as free orbiting planets.

    The distinction between minor and major planets is decently clear in our star system, but if we define it poorly it won’t help us understand other systems or why the major ones are important. It’s definitely not enough to disqualify minor planets from being full planets though. Go ahead and declare 8 major planets arbitrarily, but don’t try to justify ignoring the other few dozen planetoids poorly.



  • Memory leaks are often difficult to deal with, and many contemporary languages basically encourage them. I know many applications that suffer significant performance issues due to memory leaks, and way too many that simply don’t care about memory footprint.

    A language that treats memory management differently from the start makes all these problems much easier to deal with, if they appear at all. The real question is if the other costs of using the language are worth the somewhat niche performance gains.