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"It's almost like a mini solar system," Weaver said. "How can something about 70 percent the size of Earth's Moon have all these satellites? How can that happen? We're going to have to explain that."Originally posted by SHHCAGO
[edit on 1-11-2005 by SHHCAGO]
Really what it boils down to is what should be conidered a planet. Maybe base it on size and density
Originally posted by Jehosephat
your thinking too litteral. Size first, and then if it smaller then lets say mars (Or a given diameter smaller), it has to have a certain mass, or density. That way Gas planets are never questioned as being planets
The grey area is KBO and large moons or asteroids. Size then density could solve that since planets would have to be mostly rock, and not rock/ice or Ice
Originally posted by Darkpr0
Basically, IMHO I would say that anything clearly orbiting a star (or stars as the case may be) should be considered a planet because whether or not it was captured or formed at the start of the universe its still orbiting the sun and will otherwise work as a planet. Phobos and Deimos are Mars's moons, and though they are clearly captured asteroids we still considered moons. The sun captured a comet or asteroid from somewhere, so why can't we call it a planet?