The U.S. space agency has begun moving space shuttle Discovery to the launch pad for its first flight in over two years.
The rollout was delayed by two hours after technicians found a hairline crack in the insulating foam on an external fuel tank. Engineers later decided it was not a major concern and went ahead with the rollout.
Once the shuttle completes its seven-kilometer trip to its launching pad, it will undergo preparations for a mid-May supply mission to the International Space Station.
The U.S. shuttle program was grounded after the Space Shuttle Columbia disintegrated over Texas in 2003, killing all seven astronauts on board. The incident was blamed on foam that broke away from the shuttle's fuel tank.
Some information for this report provided by AP and Bloomberg.
