I was wondering if you could explain the theory and tell me some
good web
sites to get info about weather or not pluto is considered a planet.
There really is no theory regarding "planetness."
The word "planet" is not a
precision term, and there is nothing fundamentally different between
planets
and asteroids/comets except their size. To me, "planet"
means "A big
non-stellar thing orbiting a star." What's "big"?
*shrug* Indeed, asteroids
are also referred to in the literature as "minor planets."
As an
astrophysicist, my take on the Planet/ no Planet debate is "big
deal."
Science isn't about naming things; it's about studying their properties.
Answers provided by HSU Astronomy Professor David Kornreich.