Mars is called the Red Planet . Scientists explored Mar In the mid `20th` century . The teamperatures on Mars is unsuitable for human . The low is `-87^oC` anh the hight is `0^oC` . This is poisonous to brathe because `95%` of atmostphere is carbon dioxit . However in the mid `19th` century , people expbred a year on Mars last about twice as long as an Earth year
