Why life on Mars is not possible?

Ans. Compared to Earth, Mars has an incredibly harsh environment. Four decades of Mars exploration, which began in 1960, have demonstrated that the planet is an inhospitable, frigidly cold and an arid place. Its surface is littered with craters and giant volcanoes and has planet-wide dust storms. Mars' atmosphere is so thin that the pressure is less than 1% of the atmospheric pressure at Earth's surface. The thin atmosphere on Mars contains virtually no oxygen, a requirement of life for almost all organisms on Earth and offers no protection from incoming ultraviolet solar radiation. The planet experiences extreme fluctuations in temperature from day to night and the average surface temperature is a frosty -63°C (-81°F). At these temperatures, water cannot exist in its liquid form and all life, at least as we know it, requires liquid water.