Explain the difference between the goal of space exploration before and now., Why does the company called Planetary Resources want to explore space?, How did SpaceX get the chance to send unmanned rockets to space?, What does the investor, Peter Diamandes, mean when he said, " If you want people to explore space, create an economic incentive."?, How did Musk reduce the cost of sending rockets that transport goods in space?, What is Musk's main objective in creating reusable rockets?

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