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Where, exactly, is the edge of space? It depends on who you ask.

National Geographic Logo By Nadia Drake of National Geographic | Slide 1 of 8: After three failed launches, SpaceX CEO Elon Musk scraped together enough funding to launch a fourth version of SpaceX's Falcon 1 rocket. On September 28, 2008, Musk's gamble paid off when the Falcon 1 became the first privately developed liquid-fuel rocket to orbit Earth. The rocket is seen here lifting off from the Reagan Test Site in the Marshall Islands.

After three failed launches, SpaceX CEO Elon Musk scraped together enough funding to launch a fourth version of SpaceX's Falcon 1 rocket. On September 28, 2008, Musk's gamble paid off when the Falcon 1 became the first privately developed liquid-fuel rocket to orbit Earth. The rocket is seen here lifting off from the Reagan Test Site in the Marshall Islands.

© Photograph from NASA

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