Electric cars and vertical rocket landings were ideas you could show would work eventually with a little napkin math. It is a good critique of humanity that so many "experts" neglected to do that napkin math and just declare it impossible.
Getting starship to work reliably still involves some never done before procedures that remain to be proven. But SpaceX has a plan that might work, if it doesn't there are many ways to adjust the plan. With enough time and money, they can do it.
Colonizing mars is not so easy to show as feasible. Certainly we can launch a bunch of cans and digging equipment and get a few people living there. But anything like a self sustaining population? Don't know, we don't really have a concrete plan of how to do that. People often say, if you think you can colonize mars, colonize the Gobi Desert first, as it is 10,000 times easier.
Getting starship to work reliably still involves some never done before procedures that remain to be proven. But SpaceX has a plan that might work, if it doesn't there are many ways to adjust the plan. With enough time and money, they can do it.
Colonizing mars is not so easy to show as feasible. Certainly we can launch a bunch of cans and digging equipment and get a few people living there. But anything like a self sustaining population? Don't know, we don't really have a concrete plan of how to do that. People often say, if you think you can colonize mars, colonize the Gobi Desert first, as it is 10,000 times easier.