Despite dreaming dreams, the settlement of Mars will probably take thousands of years.
The sobering reality is that SpaceX CEO Elon Musk announces the Mars colonies as an inevitable evolution that could take place inside. There are so many technical, medical and logistical challenges to solve in his life before he can Red Planet is colonized that experts Gizmodo said it would probably take millennia to find out everything.
Science Friction  At present, we do not know how to protect astronauts from the dangerous radiation in space that they would be exposed to during a brief Mars vacation, let alone a permanent stay. Microgravity can cause dangerous changes in the human body, especially when confronted with the challenges of reproduction.
"People like to be optimistic about colonizing Mars," says Rachel Seidler, a neuroscientist at the University of Florida who studied microgravity. tells Gizmodo . "But it sounds a bit too".
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