Human bodies were evolved for environments with gravity . This causes complications with long term space travel. Living in a microgravity environment can result in changes in the muscular and skeletal system. Muscle and bone mass can decrease being in space for long periods of time. Ocular structure can also be dramatically altered. What scientists have found out is that the brain can also undergo changes. The human brain can enlarge in space. Health complications can be possible threats to astronauts attempting to colonize other planets in the distant future. The study showed from MRIs from eleven astronauts showed these changes. The problem is related to body fluids and the absence of an oxygen atmosphere. There still are many unknown factors about what being in Outer Space can do to the human body. If there is going to be a mission to Mars, there should be a full assessment of likely health risks.
