> getting to Mars using mostly Apollo-era technology has always been possible
It's not (yet) possible to shield astronauts from enough space radiation to keep them alive during the 9-month trip to Mars.
It's not (yet) possible to shield astronauts from enough space radiation to keep them alive during the 9-month trip to Mars.
I'm sorry, but this is not true. See for example http://www.spacedaily.com/news/mars-general-03w.html.