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so what IS a planet?	by unjust	2006-11-19 12:55:59
It shouldn't be defined based on similarity.	by Khaar	2005-10-04 09:16:26
About Pluto	by MatthewDBA	2005-10-04 09:23:41
So long as...	by bitflipper	2005-10-04 09:37:48
the center of mass of the planetary system follows an elliptical orbit in near proximity to the plane of the ecliptic around the stellar body, I think that would be sufficient for purposes of clssification. Now, let's add some real headaches. What about planetary systems orbiting the center of mass of a binary star (c.f. Niven and Gerrold's The Flying Sorcerers), or Kempler rosettes (c.f. Niven's Known Space collection, Ringworld series -- the Puppeteers' homeworld system)?
[ Reply ]
You're assuming that those orbits are stable	by Peace_man	2005-10-04 09:40:48
Well, stable enough to be measured...	by bitflipper	2005-10-04 09:47:41

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