There is no proof that life exists on Mars but there is evidence that may suggest there is or was life on Mars.
A meteorite was found in Antarctica
that came from Mars and some of the chemicals and
fossilized patterns found on the meteorite could
possibly have originated from a living organism
that was similar to bacteria. However, there is
much controversy on whether or not the chemicals
and fossilized patterns actually originated from
Mars or are contaminants from the environment in
More recently scientists have discovered that the gas methane exists in the Mars atmosphere which suggests that either a volcano had recently erupted causing the methane gas or a
life-form similar to some bacteria on Earth is
metabolizing carbon dioxide and hydrogen,
producing the methane gas. Other gases and
chemicals in the Mars atmosphere are metabolic
waste-products of certain life-forms on Earth,
suggesting that life may have caused these
chemicals to exist on Mars.
I think there is a pretty good chance of life having existed on Mars and maybe still existing today. But I think that any life forms on Mars will be very primitive, similar to bacteria and microbial life on Earth.
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