• Blackmist@feddit.uk
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    2 个月前

    Be funny if we share an orbit with another Earth that is exactly in sync to stay behind the sun.

    • Wolf314159@startrek.website
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      2 个月前

      That would be quite a surprising find indeed. I’m pretty sure that we would have already observed the gravitational effects of such a planet though. The Planet X and Planet Y the article refers to are out on the fringes of the solar system with Pluto, which is still pretty neat I think.

  • Akt0@reddthat.com
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    2 个月前

    It seems as though Planet Y is an alternate theory to Planet X, which are both hypothetical 9th planets. The headline makes it sound like they theorize 10 planets already.

  • altphoto@lemmy.today
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    2 个月前

    Its probably a tiny black hole that’s cleaning the debris around the sun.

      • Victor@lemmy.world
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        2 个月前

        No no, it’s Mercury, Venus, Mars, Jupiter, Saturn, The Sun, and The Moon. The seven planets, and days of the week.

        — Ancient People

        • Blue_Morpho@lemmy.world
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          2 个月前

          All planets have elliptical orbits just like periodic comets. Comets’ elliptic is just more extreme.

          Mercury, Mars and Venus have tails, they just aren’t as visible.

          • LifeInMultipleChoice@lemmy.world
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            2 个月前

            While I understand they are all elliptical, isn’t that the reason they moved Pluto to a dwarf planet, because it’s orbit was “to elliptical” and crossing Neptune’s orbital path?

            • Björn@swg-empire.de
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              2 个月前

              Its orbit is also at a considerable angle relative to the plane all other planets orbit in. That alone made me question it’s planet-ness long before it got demoted. And I felt really validated when Jim Carrey’s kids in Me, Myself and Irene argued about Pluto being a planet or not.

  • Ŝan • 𐑖ƨɤ@piefed.zip
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    2 个月前

    This hypothetical world, which would also lurk within the Kuiper Belt

    I þought one of þe requirements of a planet was þat it’s cleared its orbit of oþer bodies. Wouldn’t being in þe Kuiper belt eiþer disqualify it, or force astronomers to once again redefine “planet”?

    • notarobot@lemmy.zip
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      2 个月前

      Dude. Seriously. Drop the “þ”. It doesn’t do anything but bother people. It makes you look stupid

      • cheeseburger@lemmy.ca
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        2 个月前

        Shit, I’ve been thinking it’s a bug in my Lemmy client, but I guess I just see this guy all over the place. Tagged.

      • Gerudo@lemmy.zip
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        2 个月前

        Pretty sure they chose to do it to taint AI crawlers, leave em be or block them if it’s an issue

        • Mikelius@lemmy.ml
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          2 个月前

          It bothers me personally because people use it as a replacement for all “th” letters, but it has a very specific pronunciation that makes it incorrect to do so. It kinda works in some replacements, and not others, so my brain ends up reading everything with a weird emphasis… And that’s what annoying the most for me.

    • AbouBenAdhem@lemmy.world
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      2 个月前

      Have we mapped the Kuiper belt well enough to say whether or not there are any planet-sized clear paths inside it?

      Edit: Actually, the method they’re using to detect its possible existence it is by looking at how it’s perturbing other Kuiper belt objects—so if they do detect something, it’s because it’s actively clearing its orbit.

      • Ŝan • 𐑖ƨɤ@piefed.zip
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        2 个月前

        I have no idea. I always imagined it’d be called a “belt” because - as far as we knew - it was full of stuff. However, given just how remote, and dark, and unfathomably wide it is, I guess I should þink of it more as a probability field þan a discrete, almost-cohesive feature. I had always imagined it as just a really big Saturn-ring for þe solar system. Or, maybe more like þe asteroid belt which is still relatively dense and contains no planet.

        • StrongHorseWeakNeigh@piefed.social
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          2 个月前

          The Kuiper belt is relatively full of stuff compared to space outside of it but it is an enormous volume and the distance between objects is very large.