Space travel should be restricted to robotic missions. Billions... Yes... Billions are being wasted designing ships and equipment that humans either use or occupy. There is no need for such waste. Robots can pretty much do it all and they need no food, no air and take up very little space.
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It will enhance the state of robotics, also.
Maybe we should have settled the West through the use of robots, too. It could have waited until now.