As an expert in astrobiology and space exploration, I can tell you that surviving on Mars without a spacesuit is not feasible for humans. Mars' environment is extremely harsh and inhospitable. The average temperature on Mars is a frigid -80 degrees Fahrenheit (-62 degrees Celsius), which can drop even lower at night. The atmosphere is composed mostly of carbon dioxide, with very little oxygen, and the air pressure is less than 1% of Earth's, which is not enough to breathe. Additionally, Mars lacks a strong magnetic field or substantial atmosphere to protect against radiation, and the gravity on Mars is only about 38% of Earth's, which could have long-term effects on the human body. Without a spacesuit, a human would experience rapid decompression, extreme cold, and radiation exposure. The body would also be unable to get the necessary oxygen to breathe, leading to unconsciousness within seconds and death shortly after due to asphyxiation, hypothermia, or a combination of both. read more >>

BI Answers: How long could you survive on Mars wearing only jeans and a T-shirt? Mars is an unpleasant place. It's cold, full of deserts, and has very little oxygen or gravity. ... That's why the first requirement for visiting the red planet would be a spacesuit.read more >>