I like the "fluffy" planet - could be made of Styrofoam that has escaped Earth's orbit...Maybe there's another planet made out of socks from the Earth's dryers. Here's the Washington Post article. What an amazing universe (see John 1:3).
This reminds me that I saw Avatar - absolutely awesome CGI, although the story was basically Pocahontas in space. I'm not sure that a completely alien race would show emotion in the same way as humans - smiling, laughing, crying. But, like all good science fiction, movies such as Avatar and District 9 make us think hard about our behaviour and attitudes on this planet.