After Hours

Desktop Wallpaper: The Blue Marble known as Earth

Blue Marble 2000

Blue Marble 2000.

Credit: R. Stockli, A. Nelson, F. Hasler, NASA

By Mark Kaelin

Mark W. Kaelin has been writing and editing stories about the IT industry, gadgets, finance, accounting, and tech-life for more than 25 years. Most recently, he has been a regular contributor to,, and TechRepublic.