Watch SpaceX Falcon 9 rocket test fire in advance of launch

Eleventh-hour work to validate critical navigation and control software has forced Space Exploration Technologies to pass up a pair of launch opportunities next week, delaying the maiden flight of a commercial cargo ship bound for the International Space Station to May 19, company officials said today.
Already running about three months behind schedule, SpaceX gave up a May 7 launch slot earlier this week and during a late afternoon teleconference with senior NASA managers today, company officials decided to pass up a May 10 backup opportunity.
Space Exploration Technologies, also known as SpaceX, took a final step yesterday toward next week's historic flight as it "static fired" the Falcon.............
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