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Yeah, someone used that nifty solar system simulator (I forget the name) where he experimented with what it'd take to turn Jupiter into a star (e.g. extra mass, et cetera). It took a lot. A lot.

Yeah, I realized that later. :ROFLMAO: I was thinking of the gas giants. One facepalm for me! Anyway, Mars had past tectonic activity, despite its core basically being currently dead, and it has everything else including a very thin atmosphere, so I guess that if a planet had past or current...

Yeah, in that case Pluto's pretty much a planet bar its size. You'd obviously have to exclude moons like Titan that have the same criteria, but that pretty much is a planet. IIRC Sedna also has a similar thing going on like Pluto; Ceres doesn't, since while there is some chemical activity...

I can see both points of the debate. On the one hand, Pluto was discovered and had been classed as a planet for centuries; on the other hand, while it is the largest of the bunch, Pluto is still just one of many TNOs out there, so it can't really be called a planet any more unless we find...

It's possible. They think one of... I think it was Neptune's (?) moons is a rogue planet that was captured too, which is why it's so different compared to the others. I think it was Triton?