In this week's questions show, I tackle questions about seeding Europa with hardy Earth life, what makes galaxies spin, what are we competing with aliens for, and why is it so hard for second stages of rockets to land? Subscribe to Back to Spacehttps://www.youtube.com/channel/UCHZ63YtVtdQDqLxKyTDmtmw01:46 Why not take Earth life to Europa? 06:09 What makes a galaxy spin? 13:52 Why can't second stages be landed? 20:22 Is the search for life in space a waste of time?