Charles D. Walker (a former commercial astronaut), kicked up something of a fuss recently when he opined in the pages of the Arizona Daily Star that NASA should lead the way in space exploration and not leave everything to the private sector. The reasons he cites are risk and lack of a clear profit motive, particularly related to going to Mars. The commercial space sector should be encouraged to bring down the cost of space travel, particularly by operating a space taxi service to the International Space Station, in his view. But NASA must lead the way in exploration, particularly...
