Don't worry, Neptune is safe for now. Neptune is four times bigger than Earth and 17 times more massive. It's the third most massive planet (behind Juptier and Saturn) although it's slightly smaller than Uranus size-wise. This is from a 5th grade home-schooling site:

[link to www.enchantedlearning.com]

Pluto was downgraded because of its puny size not because of distance. I think the confusion is because it was discovered that Pluto's orbit does bring it in closer than Neptune from time to time. Several other planetoids, dwarf planets, or Kuiper Belt Objects(KBOs) have been discovered and some of those are larger than Pluto. If we find lots more (which we will) kids would have to remember the names of maybe 300 planets! So they decided to just call the big ones planets. Of course, if Pluto was as close to us as Mars or Venus we wouldn't dare demote it. It's just a mess of perspective, scientific consensus, and arbitrary rule-making. I guess that's why astronomer's have so many conferences, hehe.

Solar System model ; [link to www.solarsystemscope.com]



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