The "wait calculation" suggest that we should not do interstellar travel if we can't get to our destination within 50 years because if we can advance in propulsion system velocity, a future mission will pass the previous one and get there faster https://t.co/GC8TdL0fLL pic.twitter.com/Xgw4zpTBPL

— Massimo (@Rainmaker1973) December 24, 2019