https://newatlas.com/gateway-foundation-von-braun-rotating-space-station/58528/

https://www.businessinsider.com/spacex-starship-bleeding-transpirational-atmospheric-reentry-system-challenges-2019-2?r=US&IR=T

http://www.esa.int/Our_Activities/Space_Science/Mars_Express/Signs_of_ancient_flowing_water_on_Mars2