Why can't mars have life?

Answer 1

The jury is still out as to whether or not there is any life presently on Mars, but with each passing year, the prospects seem to dim as probe after probe comes up "empty-handed". Still, it is possible that there are some "garden spots" where primitive microbial life could exist. It would not surprise me at all if, for instance, tetanus bacteria or something very similar to tetanus, were eventually found on Mars. But there are most definitely no "little green men" or guys named Marvin running around on Mars.

Mars may very well at one time been more hospitable to life, and maybe if we ever put a manned colony up there, we might discover past evidence of a verdant period in the planet's history. However, what happened to a once wet Mars, is that because of its low mass and lack of a magnetic field (also due to its low mass), it couldn't hold onto the bulk of its atmosphere, and once the atmosphere goes, the water evaporates and goes away too.

Answer 2

Mars faces challenges for sustaining life due to its thin atmosphere, lack of liquid water on the surface, and high levels of radiation. These conditions make it difficult for life as we know it to thrive on Mars. However, there is still ongoing research and exploration to uncover potential habitats for microbial life on the red planet.