Community Apollo 13 homage episode was (is) awesome. Watch it all on the Hulu:
http://www.hulu.com/watch/184794/community-basic-rocket-science
I thought it was less strong than their other homages (in the paintball and chicken fingers episode), but it was still really hilarious, especially for those who love astronaut movies.
So, yeah, Community? Is an awesome show. Watch it!