Space exploration is a rich person's game. Every time you see a rocket launched from the Kennedy Space Center, thunderously clawing its way above the Earth's atmosphere, this represents an expenditure of tens of millions or even hundreds of millions of dollars. The cash equivalent of each space shuttle launch was a cube of US dollar bills about 25 feet (8 meters) on a side.


원문출처 : http://www.cnn.com/2017/04/01/opinions/elon-musk-change-rules-of-space-travel-lincoln/index.html