• palordrolap@fedia.io
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    3 days ago

    Pluto is a dwarf planet. “Planet” is right there in the name, so yes, it’s literally a planet.

    Ceres is also a planet. You’ll be including that one too, right?

    • Kichae@lemmy.ca
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      1 day ago

      Planet is in the name, but it’s there in the same way “democratic” is in the name of various dictatorships, or “socialist” is in the term “Nazi”.

      A dwarf planet is not a type of planet. “Dwarf Planet” is its own category of solar system object, not a subtype. It’s the same way that comets and asteroids are “minor planets”.

      • palordrolap@fedia.io
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        1 day ago

        If you want Pluto to be a planet with no modifier adjective, you can’t then just have the nine that were taught in schools for decades as “the planets of the Solar system”, because we’ve discovered several out there beyond Neptune that qualify in the same way that Pluto does.

        Most pro-Pluto arguments boil down to “there are nine because I was taught nine and nothing will ever change that (but maybe I could be convinced to allow one extra one at the end because the newspapers love a good planet X story)”.

        The mnemonics, whatever they’d be (or become) would need to account for the letters MVEMCJSUNOPSHQMGES and there would be the expectation that it could change at any minute if something new is discovered due to the rate of progress that simply didn’t exist when the nine were set in stone.

        And most arguments against Ceres being in the list would rule out Pluto for the same reason (and there’s at least one that would qualify Ceres and not Pluto - orbiting along the ecliptic.)

        • groet@feddit.org
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          2 days ago

          Cameras.

          as a human you (most likely) have 3 types of photo receptors. Green, blue and red. That’s why digital pictures mostly use RGB to save color data. They save how much red light, how much green light and his much blue light each pixel should have. For this reason the sensors of digital cameras use the same pixels , just for capturing light instead. So the camera only captures Red,blue and green light from the visible spectrum and discards all else because we as humans can’t see that other light. But for scientific cameras, what the scientists look for might not be visible RGB light. So often the cameras capture ultraviolet light or other wavelengths instead. To display the image they have to shift the colors, because a) you can’t see ultraviolet light and b) your screen can’t display ultra violet light either. So they just transform to the RGB color space. What is blue in the image now is not blue in real live but actually ultraviolet. What is red is not red in real live but actually a different wavelength you can’t see.

          This is true for basically all space images with long range telescopes like Hubble or James Webb. And for most satellites.

  • Björn@swg-empire.de
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    3 days ago

    I remember looking at an astronomy book at school and seeing Pluto’s weird ass slanted orbit and thinking that it shouldn’t be counted amongst the others. Felt really vindicated when Jim Carrey’s kids in Me, Myself and Irene argued about Pluto not being a planet. The official definition was just cleanup.

  • nexguy@lemmy.world
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    3 days ago

    I imagine nasa would be perfectly fine with Pluto still categorized as a planet. It was just a handful of people at a IAU conference(many had left by the time the vote happened) that made the change.