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Astronomy and Cosmology
Astronomy and Astrophysics
Planetary debris found in white dwarf atmospheres
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[QUOTE="Vanadium 50, post: 6455117, member: 110252"] I think the definition is terrible. Exoplanets are technically not planets. An object at a particular place and time is a planet but the same object at another time or place is not. I understand why they did it (although I would argue that the problem is not, as Wkkipedia claims, with Eris but rather with Sedna) but I think the solution is no better. There are better ways to clarify this than adding "potentially" in front of "clearing the neighborhood", such as comparing the mass of the planet to the sum of all other bodies in its "neighborhood". By that standard, Earth (the most planetty planet) is 1.700,000 and Ceres is 0.33. There are no objects between Mars at 5000 and Pluto at 1/3. [/QUOTE]
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Astronomy and Cosmology
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Planetary debris found in white dwarf atmospheres
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