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Definition of Planet

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Whatever your definition of planet, the 9 planets system is bad astronomy because including Pluto as a planet and excluding bodys of a similar size class and placing it with a size class in which it does not belong is incoherernt and nonsensical. Also, contrary to the standard model (the planetismal hypothesis), planets were formed in pairs by fission from the sun; that is the only explanation for the twin pairs of Venus-Earth and Uranus-Jupiter; ther is also twining among moons of outer planets, which formed in the same way(see MetaResearch web site). Originally, there were 6 pairs but their twins blew up leaving the moon Mars which became a planet and Venus' moon Mercury drifted to become itself a planet, too, making the Classic 8.
What is the best scientfic definition of planet?
any body that is circumsolar (directly revolves around the Sun as opposed to a moon); this includes dust particles (micrometeoroids) up to Jupiter; in this the major planets are the Classic 8 and the minor planets are the planetoids (or asteroids) and meteoroids (comets are special group and are mostly planetoids).
any circumsolar body that is spherical (has hydrostatic equilibrium); the lower limit could be as low as about 1 mile diam. to as high as about 600 miles. diam.
any circumsolar body that has the size to maintain a true atmosphere and magnetosphere (the Classic 8)
other
don't know/not sure
What hypothesis for planetary evolution do you favour?
solar fission
planetismal
binary
interstellar cloud capture
floccule
other
don't know/not sure
How do you think th e asteroid belt was formed?
explosion or explosions
collisions
failed planet/failed major planet
other
don't know/not sure
This poll was created on 2011-04-07 15:03:59 by Philogynist