This is really cool.
Makes me like science and shiz.
http://vimeo.com/15091562
Basically, a dad and his son built this "spacecraft" that went up 100,000 feet and managed to record it with an HD camera. At 100,000 feet, you can see the earth's curvature (as well as the sun, though it's not in the video). And then the balloon pops and the spacecraft falls back down to Earth.
It's really fascinating.