ADVANCE FOR WEEKEND MEMBER EXCHANGE.; FOR SUNDAY, FEB. 9 - FILE - This artist's rendering provided by Sierra Nevada Space Systems shows the company's proposed Dream Chaser spacecraft docking with the ... more 
ADVANCE FOR WEEKEND MEMBER EXCHANGE.; FOR SUNDAY, FEB. 9 - FILE - This artist's rendering provided by Sierra Nevada Space Systems shows the company's proposed Dream Chaser spacecraft docking with the International Space Station. The rise of commercial space raises questions about the future of Houston as Space City, which for the entire history of U.S. spaceflight has been responsible for training and managing the flights of U.S. astronauts. (AP Photo/Sierra Nevada Space Systems, File) less 
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Associated Press | Photo By Sierra Nevada Space Systems, File
Fri, Feb 7, 2014 4:45 PM EST