How many can we make of these?

Very true.... The next big problem with machine is power ... I believe I read somewhere just to get to mars and to live off solar power requires 2 times more the amount of solar panels than earth with it being a bit further away from our sun. As you go further out it's not even vaiable as you need I think 10 times more solar panels just to make the same as one solar panel as on earth does. Which become pointless and need alternative energy to run the machine. I really hope there is one day infrastructure to send out a fleet of refinery and manufacturing and miner and 3d printer to a planet.. leave it to it's devices for 10-20years. Crazy.

It will when we see a big ass comet coming directly at us..... Never mind the dinosaurs. We are Gona end up as the next cycle