Good question. I've never done that in vue. Maybe create a sphere and size it up to encompass the planet. I haven't worked too much with the material editor but it seems have most of the settings you would be looking for. Transparency, specularity and so on. I might also look at fuzzy materials for clouds.
Hey that's pretty cool. I think it would be cool to be on a planet like that. If all those trees were fruit trees, I had my computer, dog, and wife, I would be happy as a clown. LOL I'm an introvert as you can tell.