Elon Musk is nothing if not audacious. The billionaire PayPal co-founder burst onto the space scene in 2002 with plans to build a small rocket at a fraction of the cost of comparable vehicles, a claim that grabbed the interest of prospective customers while ruffling the feathers of many in the industry's establishment. The Falcon 1 rocket eventually did launch successfully - after three initial failures - but took longer and cost more than Musk anticipated.
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