In 2021 a NASA space vehicle has successfully landed on Mars to gather information about the potential for finding that life once existed, currently exists and / or potentially could be supported in the future, the not too distant future, when a planned man landing on Mars becomes possible.
But what are they likely to find? Could it ever be possible that Mars, or for that matter any other planet in the solar system, could support human life?
Here is a presentation dating from 1996 discussing this very issue subsequent to speculation at that time concerning life on Mars.