One of the biggest concerns that space agencies like NASA and SpaceX have when it comes to bringing humans to Planet Mars is survival.

Humans are poorly suited to life in space. The BBC reports:

We are products of 3.8 billion years of evolution in a comfy 1g oxygen-rich biosphere, protected by a magnetic bubble (the magnetosphere) from the harshness of the Universe. Away from the Earth, astronauts are bombarded by cosmic radiation and suffer nausea, muscle and bone loss, deteriorating eyesight and even weakened immune systems as a result of zero gravity.