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Post by SherlockHolmes on Dec 11, 2023 18:48:48 GMT
Just as the title says, its a Planet. Change my mind without using Astrology (Looking at you IAU).
Arguments: They say it and its moon orbit each other... So yeah I guess Alpha Centauri isn't really a Star then huh?
Actual Planetary Scientists consider it a 'Planet'.
Its geologically active than Mercury (That's still considered a planet)
Since being categorized as a "Dwarf Planet" Pluto was later discovered to be 50% larger than previously thought by the New Horizons probe.
The IAU's reasoning to not classify Pluto as a planet is because it doesn't "Clear its orbit"
Talk about flawed reasoning If you take that at face value, then there are no planets in our solar system, because no planet 'clears its orbit'. Earth itself is affected by its moon, the gravitational forces of Jupiter, and the rest of the planets in the solar system.
so yeah, Pluto is a Planet. I dare anyone to change my mind.
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Post by scenario on Dec 11, 2023 20:01:22 GMT
I always considered major planets, Dwarf Planets and rogue planets to be subsets of the same thing. But you need some sort of dividing line. At the small end you have asteroids. When they get large enough to become roughly spherical and orbit the sun, they are dwarf planets. When their spherical, orbit the sun and can clear their orbits, they are major planets. If they aren't orbiting the sun they are a rogue planet.
The problem with definitions like this is that there are always borderline cases. If Neptune and Pluto are ejected from the solar system, they are both rogue planets. And how spherical do they need to be. The Enterprise will chart trillions of heavenly bodies. Putting them in nice neat categories is hard.
99% of the matter in the solar system is in the sun. 99% of what's left is in Jupiter. Everything else is just leftovers.
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Post by SherlockHolmes on Dec 12, 2023 20:24:24 GMT
99% of the matter in the solar system is in the sun. 99% of what's left is in Jupiter. Everything else is just leftovers. That is really mind boggling if you think about it. So maybe I'm misunderstanding what "Clear its Orbit" means. Like what does that exactly mean? |
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Post by scenario on Dec 12, 2023 22:16:44 GMT
It basically means they are big enough that they are the only thing in their orbit. If an asteroid breaks up you might have hundreds of small chunks orbiting in the same orbit. A major planet would either attract the pieces or push them out of the orbit. The exception are the L1, L2, L3,L4 and L5 points which are metastable. The Web telescope is in Earth's L2 point. It is past the moon. It needs very little propellent to stay in place.
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IceMan
New Member
Fluffing
Posts: 5 
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Post by IceMan on Jan 20, 2024 3:57:40 GMT
It doesn't meet the definition of a planet. That's pretty much the end of the discussion, really. This is sort of like "Alligators are mammals, change my mind." Alligators don't fit the definition of mammals, and Pluto doesn't fit the definition of a planet. The only way Pluto can be a planet is if we change the definition to make it possible again. I don't want Pluto counted as a full planet unless every other large KBO counts as a planet, too, and we have to reinstate Ceres, Pallas, Juno, and Vesta.
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Post by SherlockHolmes on Feb 6, 2024 23:36:39 GMT
It doesn't meet the definition of a planet. That's pretty much the end of the discussion, really. This is sort of like "Alligators are mammals, change my mind." Alligators don't fit the definition of mammals, and Pluto doesn't fit the definition of a planet. The only way Pluto can be a planet is if we change the definition to make it possible again. I don't want Pluto counted as a full planet unless every other large KBO counts as a planet, too, and we have to reinstate Ceres, Pallas, Juno, and Vesta. My problem is WHO came up with the qualifications to be a planet. I find the who set of qualifications flawed. |
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Post by Sehlat Vie on Apr 9, 2024 14:21:56 GMT
Just as the title says, its a Planet. Change my mind without using Astrology (Looking at you IAU). Arguments: They say it and its moon orbit each other... So yeah I guess Alpha Centauri isn't really a Star then huh? Actual Planetary Scientists consider it a 'Planet'. Its geologically active than Mercury (That's still considered a planet) Since being categorized as a "Dwarf Planet" Pluto was later discovered to be 50% larger than previously thought by the New Horizons probe. The IAU's reasoning to not classify Pluto as a planet is because it doesn't "Clear its orbit" Talk about flawed reasoning If you take that at face value, then there are no planets in our solar system, because no planet 'clears its orbit'. Earth itself is affected by its moon, the gravitational forces of Jupiter, and the rest of the planets in the solar system. so yeah, Pluto is a Planet. I dare anyone to change my mind. I prefer to think of it as a planetoid (dwarf planet sounds kinda sizeist). Why they don't call it a planetoid defies reasoning. And if it's a planet, then there are other Kuiper Belt Objects (and in the asteroid belt) that rival it in size, and should be called planets as well (Sedna, for example; or the asteroid Ceres). Pluto has a very elliptical orbit that crosses within Neptune's orbit; in that way, it's more like a big comet or asteroid. Jupiter's moon Io is the most geologically active body in the solar system, as are several Saturnian moons with ice geysers. Are they planets as well? I think the standards of what makes a planet is more at issue than Pluto's status, perhaps. And IAU? Planetoid. Try it. Worked for Star Trek. |
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I am so sorry...