Stephen Hawking is advocating lunar and Martian space colonies. However, he’s apparently unaware of the most recent research by inner solar-system astronomers which indicates that just a manned journey to Mars, leaving alone the idea of settlement, appears to be much more problematic now than it was at one time.
The difficulty or concern? It’s not mechanics or logistics. Rather, research has shown the cosmic ray danger to be higher, even much higher, than previously thought.
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