re: Moon Mars plans
"Critics argue you can send dozens of robots for the price of one manned mission."
Yeah and how many man MINUTES of work do you get for that? A prime example of a bogus comparison. If you are going to evaluate cost effectiveness you don't compare absolute numbers you compare what you get for what you invest. The absolute value determines whether you can tackle the task or not, but not how worthwhile it is.
Regards,
Mark