Spacewalker: A moment for perspective

Astronaut Joseph Acaba caught spacewalking by fellow astronomer Ralf Vandebergh on Vandebergh's approach to the ISS in March, 2009.

My brain cannot comprehend the courage it must take to step out of the sealed environment of a spaceship and into the vacuum of space, but that's probably why I'm a writer and not an astronaut (among many other reasons, I'm sure).