system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why colonize Mars and not Antarctica?

Wikipedia claims that the average temperature on Mars is -85 degrees F, which is pretty darn cold.  When you add other terrible things like radiation, extreme distances between the Earth and a lack of a huge water supply, why are we considering colonizing Mars when there is an entirely uninhabited continent on Earth?  Is it merely the romantic idea of space travel and exploration?
gpt
It's partly because it's more awesome, partly because we already have people living on antarctica (been there, done that).

However, looking forward to developing long term coping strategies for humanity, antarctica doesn't solve all of our problems.  We want planet-redundancy and learning how to _get to_ and _live on_ a planet that is separated from supply lines, has a different set of challenges than we have on earth (not just temperature) is a unique challenge, with a unique long term reward.