A brief bit about world building

Remember a couple weeks ago when I was all gung-ho on my Steampunk/Sci-fi idea? Well, that's on the back burner now. I had begun a heist story that I think I will finish first. The Steampunk/Sci-fi requires so much world building that I want to let it stew awhile. I take world building seriously, especially for a Sci-fi novel that will involve at least one planet that isn't Earth. Think about it. I have to:

Design a planet
This one was fun for me because I got to play physics nerd for awhile. M...