Fourth Crack Discovered On Space Shuttle Discovery's Fuel Tank

[Newsbot]

NASA engineers have found another crack - the fourth so far - in the metal skin of the external fuel tank attached to the space shuttle Discovery. http://feedads.g.doubleclick.net/~a/aKvfRPb3IPgtEMCgaiWTYyBQF8A/0/di (http://feedads.g.doubleclick.net/~a/aKvfRPb3IPgtEMCgaiWTYyBQF8A/0/da)
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