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It's Official - From the BBC news site
I know Wolverine has mentioned the passing of resolution 5A on another thread, but for the announcement would it be an idea to use this thread?
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Pluto and other would-be planets are now called "dwarf planets". Everything else (not counting satellites) are "small solar system bodies".
Ah, Resolution 6A passed: Pluto and "Pluto's Pals" officially form a new type of trans-Neptunian objects.
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No, dwarf planets (Pluto, 2003 UB313, etc.) that orbit beyond Neptune form a new class of objects.
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“a celestial body that is in orbit around the sun, has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a ... nearly round shape, and has cleared the neighborhood around its orbit.” Then what does the overlapping orbit have to do with it? Pluto is automatically disqualified because its oblong orbit overlaps with Neptune’s. Is that because it hasn't cleared Neptune from it's orbit? I think a better explaination is in order. It was unclear how Pluto’s demotion might affect the mission of NASA’s New Horizons spacecraft, which earlier this year began a 9˝-year journey to the oddball object to unearth more of its secrets. Yep; the science of Pluto isn't valid anymore. Charon, the largest of Pluto’s three moons, is no longer under consideration for any special designation. Is Charon still considered a moon if Pluto isn't a planet? Is there a definition of a moon? (that'll probably be the next controversy) |
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Pluto is not a planet, nor is Charon. The definition of a satellite remains open, as well the definition of planets beyond the Solar System.
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Science is a way of trying not to fool yourself. The first principle is that you must not fool yourself, and you are the easiest person to fool. -- Richard Feynman |
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Live webcast here for what's left of the business.
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Is a Dwarf star not a real star then? I don't think it resolves much. It certainly doesn't detract from the fact that Pluto is a system which we should try and find out as much as possible about.
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So will NASA cancel New Horizons whilst it is in flight and save the money for other things now that Pluto is no longer a planet?
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Right decision! ![]()
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Science is a way of trying not to fool yourself. The first principle is that you must not fool yourself, and you are the easiest person to fool. -- Richard Feynman |
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The phrase I learned at school almost 50 years
ago was Many Vocanoes Erupt Mulberry Jam Sandwiches Under Normal Pressure. Now perhaps the IAU will learn the meaning of the word pressure and issue a correcting resolution in three years. In the meantime a new phrase might be in order reflecting the true state. Perhaps a note left on the washing machine by a chap to his wife or girlfriend; My Vest Exhales, My Jumper Stinks, Underpants Need Persil. X |
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One thing that has to be kept in perspective here is that the IAU is not a body that has any coercive power. What this means is that the astronomers of the world have come to a consensus on it. But nobody risks jail for calling Pluto a planet if they want to.
Personally I kind of like the idea of restricting the word "planet" to the ancient planets, up to Jupiter. In other words, the "wanderers" that can be seen with the naked eye (I know, Uranus is iffy in that respect, but the ancients didn't know of it). And everything else is "satellites" or something or another. Uranus and Neptune and all the other bodies would be satellites of the sun, and Titan would be a satellite of Saturn, etc. But back to the point, this is just a definition of a word. Nothing changes about Pluto or any other body because of a human desire to make categories. It's just like what another poster wrote in another thread about the distinction between the animal and planet kingdoms.
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What science? So planets can only be objects that orbit the Sun? What then are those objects orbiting other stars? Or, while we're in the process of regressing astronomical thought, are were going to backstep to say the Sun is the center of the universe again?
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I mean, how can you draw a line and say right, this is one type of object, this is another?! There are clear differences between the Inner planets and the gas giants as well as the asteroid belt separating them, but they are all planets..... Mercury has very little in common with Jupiter....
Surely recognising clearly that the term planet is in itself a very loose description is the way forward, not trying to draw a line in the sand and define a planet. What room for manouver is there? How does this fit in with the types of object which are being found around other stars?
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