Astronauts Traveling To Mars Could Be Protected By a Poop ShieldEric Limer3/03/13 10:00am66EditPromoteGo to permalink There are all kinds of dangers on a trip to Mars. Muscle atrophy, cramped quarters, social/isolation stress, being in space. Take your pick. One of the biggest though, is being exposed to all manner of radiation and cosmic rays without an o-zone layer to keep you safe. The solution? An O-zone layer of poop. Basically.