The "colonizing the universe" diagram seems to be taken from this paper: https://www.fhi.ox.ac.uk/wp-content/uploads/space-races-settling.pdf https://www.fhi.ox

The "colonizing the universe" diagram seems to be taken from this paper: https://www.fhi.ox.ac.uk/wp-content/uploads/space-races-settling.pdf https://www.fhi.ox.ac.uk/wp-content/uploads/space-races-sett...