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posted by on Wednesday February 22 2017, @01:02PM   Printer-friendly
from the i-can-be-a-planet-too! dept.

Scientists against the demotion of objects like Pluto, Eris, Sedna, etc. to "dwarf planet" status have crafted a new definition:

It's no secret that Alan Stern and other scientists who led the New Horizons mission were extremely displeased by Pluto's demotion from planet status in 2006 during a general assembly of the International Astronomical Union. They felt the IAU decision undermined the scientific and public value of their dramatic flyby mission to the former ninth planet of the Solar System.

But now the positively peeved Pluto people have a plan. Stern and several colleagues have proposed a new definition for planethood. In technical terms, the proposal redefines planethood by saying, "A planet is a sub-stellar mass body that has never undergone nuclear fusion and that has sufficient self-gravitation to assume a spheroidal shape adequately described by a triaxial ellipsoid regardless of its orbital parameters." More simply, the definition can be stated as, "round objects in space that are smaller than stars."

From the proposal:

The eight planets recognized by the IAU are often modified by the adjectives "terrestrial," "giant," and "ice giant," yet no one would state that a giant planet is not a planet. Yet, the IAU does not consider dwarf planets to be planets. We eschew this inconsistency. Thus, dwarf planets and moon planets such as Ceres, Pluto, Charon, and Earth's Moon are "fullfledged" planets. This seems especially true in light of these planets' complex geology and geophysics. While the degree of internal differentiation of a given world is geologically interesting, we do not use it as a criterion for planethood in the spirit of having an expansive rather than a narrow definition.

Here's another article about the significance of the New Horizons mission. New Horizons will fly by 2014 MU69 on January 1, 2019.


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  • (Score: 2) by FatPhil on Wednesday February 22 2017, @11:13PM

    by FatPhil (863) <pc-soylentNO@SPAMasdf.fi> on Wednesday February 22 2017, @11:13PM (#470506) Homepage
    If he thought that you were implying that the planets stop at Jupiter, and that Saturn..Neptune don't count as planets in your eyes, then he's cleary having a argument with an imaginary opponent.

    It's true you could have worded it in a more spoon-feedy manner, but it was clear enough what you meant, IMHO, as you couldn't have meant the above, and therfore some other range was being expressed by your "from .. to ..".
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  • (Score: 2) by tangomargarine on Thursday February 23 2017, @03:47PM

    by tangomargarine (667) on Thursday February 23 2017, @03:47PM (#470732)

    Oh, range of *properties*? I was reading that as "geographical range," and past Jupiter was excluded because it was common knowledge dwarf planets were in that area.

    Guess my eyes skated over "types" for some reason :P

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