what is the meaning of life?

That's how our planet was formed, another planet hit ours, and they molded.

The moon is just a big rock that flew away.

And I think they concluded Pluto is a planet, because it has rock in its center.

Indeed, the current theory is that there were dozens and dozens of small planets that collided with one another. That is how the moon supposedly was made ...but there are objects larger than pluto which are comprised of rock =P. Did you see where it was decided? I was thinking it'd be newsworthy.

It's a planet because has rock in its centre? As in solid rock, or molten rock?

If molten rock, then I can understand why it's a planet, and bigger things in the Keiper Belt aren't... but if it's just rock, well, if that's the case then EVERYTHING, or at least most things, are planets.

I'm almost absolutely sure Pluto does not have a molten core. Bahaha, I just named a dungeon off WOW.

What about the gaseous planets? They don't have solid cores, right?

That's what school and common sense are for.

What about the gaseous planets? They don't have solid cores, right?

Im not thinking rocky cores determines if it's a planet or not ...here I'll look up the criteria:

K, there are none. There is no set definition on what makes a planet and what doesn't =P. I suppose it's a planet if you say it is.

All the planets:

Mercury - Iron Core
Venus - Semi-solid iron-nickel core
Earth - Solid iron-nickle core
Mars - Slid rock core

Jupiter - Rock core
Saturn - Rock and ice core
Uranus - Solid rock core
Neptune - Silicate Rock Core

Pluto - Large Rock Core

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Well ain't that something. I always thought the planets had molten cores. Probably because we've got a molten outer core.

I call dip on Merury and Venus, after I sell all the iron and nikle, I will be rich bitchies.