• don@lemm.ee
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    1 year ago

    Calling an asteroid a stone, while technically true, is akin to calling the planet it struck a rock-covered ball bearing.

    • FilthyShrooms@lemmy.world
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      1 year ago

      A “rock-covered ball bearing” is much more accurate than what a lot if people call it. Better than a pebble in space

      • don@lemm.ee
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        1 year ago

        That I’ve met as many people as I have who assume it’s solid rock and that we can drill completely through it is… disconcerting.

    • Gormadt@lemmy.blahaj.zone
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      1 year ago

      I mean, the planet is likely smoother than a lot of ball bearings

      The highest point and the lowest point aren’t very far deviated. Less than 6 miles up and less than 6 miles down. Basically a little less than 0.001% deviation.

      Edit: After doing a bit of digging it looks like Earth would be comparable to a 1 inch grade 1000 ball bearing. Grade 1000 are not remotely close to the highest grade, in fact it’s one of the lowest grades of ball bearings.

      mobile link, sorry

      God damn ball bearings get down to some crazy tolerances at the really high grades.

      I’m happy I dig some digging into it.

      • bufordt@sh.itjust.works
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        1 year ago

        New ball bearings are still likely significantly smoother than the earth. Old worn out ball bearings might be rougher.

        • Gormadt@lemmy.blahaj.zone
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          1 year ago

          After doing a bit of digging it looks like Earth would be comparable to a 1 inch grade 1000 ball bearing.

          mobile link, sorry

          God damn ball bearings get down to some crazy high tolerances.

          I’m happy I dig some digging into it.

          Edit: Grade 1000 is a really low grade ball bearing, thought I should clarify that.

      • autokludge@programming.dev
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        1 year ago

        It’s only natural that it would be rougher than most grades of ball bearings – as we already established its covered in rocks!

      • don@lemm.ee
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        1 year ago

        So you’re saying the earth is a very smooth ball bearing. This despite being classified as an oblate spheroid.

        • Deuces@lemmy.world
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          1 year ago

          I’m guessing smoothness doesn’t consider the non-spherical shape of the planet, just the bumpiness of it. But I’m also some random on the Internet, so who knows

          • don@lemm.ee
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            1 year ago

            I think I’m missing what the smoothness of the planet has to do with it being basically an iron-nickel ball covered by a bit of rock, but being a meat popsicle, I tend to miss a lot of things.

        • Gormadt@lemmy.blahaj.zone
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          1 year ago

          The difference in diameter between the pole and the equator is only about 26 miles.

          7926 miles vs 7900 miles

          So a difference of about 0.03%

          Yeah I’d say that’s pretty spherical

          Edit: Rereading this it comes of a bit rougher than I intended. Basically what I’m saying is something can be spherical without being a perfect sphere, infact if to be a sphere (in common usage of the word) only applied to perfect examples of a sphere than nothing would be a sphere. Definitions are pretty wishy-washy a lot of the times, especially when it comes to describing the world as it is.

          Earth is an oblique spheroid, technically. But calling it a sphere is true enough to observers that I’d say it still counts.

  • k110111@feddit.de
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    1 year ago

    It depends… If we consider earth, which is a rock, in this calculation. Earth would be the biggest killer

    • Valthorn@feddit.nu
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      1 year ago

      But is it Earth itself that kills the birds? Seeing as it is the rock quality of the Earth we’re after, how many birds die from being struck by it? Does flying into the ground count as being struck by the Earth, if it is the bird that launches itself against it?

      • Jimmycrackcrack@lemmy.ml
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        1 year ago

        If you restrict it only to being struck by a rock then actually, while still probably the title holder, the meteor actually probably has a much lower body count than one might first assume. In fact I wonder if there’d be any way to calculate the average number of birds/avian creatures in the space occupied by the meteor at the time who could have been directly hit by the meteor not just killed off from second order effects.

  • VikingHippie@lemmy.wtf
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    1 year ago

    Once again: dinosaurs are not birds and birds are not dinosaurs.

    That’s akin to saying that beloved character actor Margo Martindale is a prehistoric fish or that a prehistoric fish is beloved character actor Margo Martindale.

    • loaExMachina@sh.itjust.works
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      1 year ago

      First off, Yes, dinosaurs are birds. Unlike the word “fish”, which was in used long before terms or concepts like “monophyletic” were invented, “dinosaur” is a scientific term that arrived around the time scientists were developping cladistic classification, and the scientists have made the choice of defining it as a clade (a theoritical last common ancestor+ all of its descendants). Therefore, any descendant of a dinosaur is a dinosaur.

      For older words, the scientist definition doesn’t need to be taken into account in general use, for example, the scientific definition of “berry” is famously different from it’s popular definition, but you don’t use the scientific definition in everyday life. But for “dinosaur”, a word coined by scientists referring to something that is only known through science, it makes less sense to ignore the scientific definition.

      As for dinosaurs not being birds, that is true for most, but if birds are dinosaurs, then there were some dinosaurs that were birds. There’s actually two conflicting definitions of birds: If it’s a theropod that could fly or is descended from one that could, and is closer to any modern bird than to deinonychus, then birds (=Aves) appeared either in mid Jurassic or in and were already quite diverse before the K-T extinction, including the enanthiornithes and hesperornithes groups, that disappeared during the extinction.

      If you define it as the common ancestor of all modern birds and its descendants (=Neoornithes), then they appeared in the late creataceous.

      Using either definition, it is clear that they all look more at birds than like anything else, and a layman seing one if them out of context would immediately think of them as a bird (tho maybe a strange one) rather than as a dinosaur. So unlike for berries or fishes, there would be no conflict between either the scientific definition of “bird” and the popular one. Either way, only 3 separate lineages among them survived, so the meteorite did kill whole bird species.

    • PetDinosaurs@lemmy.world
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      1 year ago

      You seem to have stumbled on the fact that fish is not a useful term because you cannot come up with a consistent definition of fish that doesn’t include beloved character actor Margo Martindale without excluding things that are obviously fish. It’s the same with “tree”.

      You are correct that dinosaurs are not birds, but birds are dinosaurs in the same sense that you are a mammal.

      • Klear@lemmy.world
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        1 year ago

        Here’s the thing. You said a “birds are dinosaurs.”

        Is it in the same clade? Yes. No one’s arguing that.

        As someone who is a scientist who studies birds, I am telling you, specifically, in science, no one calls birds dinosaurs. If you want to be “specific” like you said, then you shouldn’t either. They’re not the same thing.

        If you’re saying “dinosaur clade” you’re referring to the taxonomic grouping of Dinosauria, which includes things from ankylosauruses to herrerasauruses to jackdaws.

        So your reasoning for calling a birds a dinosaur is because random people “call the feathered ones dinosaurs?” Let’s get tyrannosauruses and deinonychuses in there, then, too.

        Also, calling someone a human or an ape? It’s not one or the other, that’s not how taxonomy works. They’re both. A bird is a bird and a member of the dinosaur clade. But that’s not what you said. You said a bird is a dinosaur, which is not true unless you’re okay with calling all members of the Aves class dinosaurs, which means you’d call blue jays, ravens, and other birds dinosaurs, too. Which you said you don’t.

        It’s okay to just admit you’re wrong, you know?

    • TWeaK@lemm.ee
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      1 year ago

      If beloved character actor Margo Martindale wanted to be a fish, then no one would know that beloved character actor Margo Martindale was not a fish.

      • VikingHippie@lemmy.wtf
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        1 year ago

        True, beloved character actor Margo Martindale is just that good at what beloved character actor Margo Martindale does!

    • k110111@feddit.de
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      1 year ago

      Woah woah woah, don’t bring beloved character actress Margo Martindale into this. Beloved character actress Margo Martindale had nothing to do with this. Leave beloved character actress Margo Martindale alone!

      • VikingHippie@lemmy.wtf
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        1 year ago

        I’m just saying that beloved character actor Margo Martindale is not a fish and that no fish is beloved character actor Margo Martindale, that’s all! I would never defame the good name of beloved character actor Margo Martindale!

    • sabreW4K3@lemmy.tf
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      1 year ago

      Hasn’t there been more and more discoveries leaning in that direction? Not that all, but more and more, including everyone’s beloved Tyrannosaurus Rex was just a giant bird?