The Impossibility of Long Distance Space Travel

Alan Finkel writes today on the Cosmos website:

The clash of two titans – physics and chemistry – are major barriers to human space travel to Mars and beyond, and may well make it impossible … at least with current technologies.

The problem is that carrying along everything that is required to support human life in space—water, air, food, fuel—makes long-distance space travel by humans impractical if not impossible. Space is bigger than people realize, and things are just too far away for humans to get there.


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