Valles Marineris crank idea

I have a crank idea that the Valles Marineris could have been built as a long launch track for projectiles into space at some point in the past. I know this crank foolishness but I don't have any familiarity with what crank ideas have already been discussed, how, or where to find them.

I also wonder if the sun might have been hotter a long time ago and for that reason maybe mars had different climate characteristics.

Thanks in advance for any responses from those that have discussed Mars more than I have, which would be everyone on this forum, I imagine.