Here are the promised links to resources for physical worldbuilding. Best of luck in your writing projects!
Links
World Builders Home Page
Black plants 'could grow' on exoplanets with two suns
World-building and ConLangs
Pre-draft Research Bibliography
Files
The worldbuilders.iso and worldbuilders.zip files are copies of the www.world-builders.org web site and offered here freely as instructional tools, as per the terms of use listed on the World Builders Home Page. The Physical Worldbuilding Guide is my creation, which draws heavily upon the World Builders Home Page and upon Patricia Wrede's Fantasy Worldbuilding Questions.