For some reason, today I decided to make a picture of the earth from space, using the NASA Blue Marble Next Generation dataset, some infrared satellite data (from today, no less) and my trusty homebrew raytracer. Ten minutes of work, and I got the image on the right. Not too bad, even if it doesn't include any atmospheric effects.
Just my ten minute hack of the day.
Addendum: Want to do a better job? Check out this paper.
Addendum2: Check out this picture of the shadow of the moon on the earth taken from the ISS.