Sometimes I don't need to justify space exploration - space will just speak for itself (with a little help from NASA)

http://www.youtube.com/watch?feature=player_detailpage&v=Jl_qA5I_ycA

In a similar vein, I also highly recommend the Astronomy Picture of the Day (APOD) if you haven't seen it before. The daily pictures motivate me each morning just as much as my coffee.