Our bodies were not created to spend time in a zero-gravity atmosphere. We shouldn't subject our bodies to this type of change if we want to continue living long, healthy lives. It doesn't change or only affects our bones and muscles. Space travel also changes blood flow, which can cause problems with our body's organs. Traveling in space leaves astronauts tired, sick, weak, some develop illnesses and some even suffer from depression. I think we should not continue space travel at this time until they can invent and create a space shuttle that can produce a gravitational atmosphere. It would keep the astronaut feeling as normal as possible, so when they return from space there would be no health problems, whether temporary or