Should NASA go with constellation or direct?

NASA is highly skilled at picking losers in the past 30 yearsShould NASA go with constellation or direct?the big advantage of re-using parts is that you're also re-using the parts factory. it saves a lot of money not to have to re-tool the shop.Should NASA go with constellation or direct?Hi. My guess? Direct is simpler and therefore has fewer things that can go wrong. I do disagree with your 'loser' hypothesis though. There have been many successful missions. Look at the "Spirit" and "Opportunity" missions.