Yes, that really actually is Buzz Aldrin rapping with Snoop Dog...
http://www.funnyordie.com/videos/0be5c681fc/buzz-aldrin-s-rocket-experience
There's a 'making of' video also here: http://www.funnyordie.com/videos/f7a26d7505/making-of-buzz-aldrin-s-rocket-experience-w-snoop-dogg-and-talib-kweli
