A nice course dealing with space environment, vehicles, medical aspects and research, and astronaut training. It's an introductory course, but gives a nice load of useful information even for professionals, since it tends to connect interdisciplinary data. Too bad it does not offer any certificates, but it's great that it's available. The teaching style is nice, and the assignments were a learning experience, and not too difficult. I'd like to see an advanced version of this course as well.