yeh but ok suppose hypothetically mankind was to survive for billions of years...wouldn't the expansion of the sun into a red giant deem mars inhospitable eventually, after we reach the peroid of mars being the new earth climate-wise...we would be driven out further out of the solar system, so wouldn't europa be feasible in the long run, well hypothetically anyways seein as mankind are so stupid we'll probably wipe out our own species through dumb shit like nuclear warfare.