How Many Planets Anyway?

How about, over 300? That's the number of trans-Neptunian objects we're up to, and if Pluto's a planet, then so are they.

Yeah.

Every single one.

I'm thinking of poking around and doing some research into how we ended up there, how there are so many relatively large objects in the outer system.

I'm sure we know, but I need to do the research to understand it.