An Apollo 8 astronaut, he is probably most famous for taking the Earthrise photograph during that mission. When I was in Jr High, our science teacher had a poster of that photograph, with the quote "One day, I hope to look up through a quarter million miles of nothing and say "Gee, there's a beautiful earth out tonight", and that particular bit of inspiration has lived rent free in my head for over 30 years now.

--
-Pasha
"Don't change the subject"
"Too slow, already did."