On: Elon Musk says he will put millions of people on M...

[RyanMcGreal]

> 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.

[jcarreiro → RyanMcGreal]

> 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.

[jeffreymcmanus → RyanMcGreal]

Incorrect. Shielding humans from radiation has been a solved problem for decades. The fact that Skylab didn't need to do it does not mean that traveling to Mars is impossible.