Sedna

Originally posted by ivan_2068


Well Yesspaz, the orbit of a comet is absolutely different to the orbit of a planet, it's not heliocentic because it crosses the orbits of other planets, the orbit of a planet is almost perfectly heliocentric and independant to other plamets, unless something really catastrophic happens).

Of course the comets have other features that planets don't have like tail, nucleus, coma, etc.

Iván

Pluto IS a planet and it's orbit crosses that of Neptune. I think that at the moment or at least until recently Neptune was the furthest planet from the sun.