NASA is all set to try its luck for the sixth time as it plans to launch the space shuttle Endeavour Wednesday evening with seven astronauts on board.

Hitherto NASA has cancelled the Endeavour launch for five, three times due to thunderstorms and two times due to hydrogen gas leaks, making Obama administration officials to put question on the plan.

Forecast reveals the odds of good weather on Wednesday evening is sixty percent.

The mission of the Endeavour is to deliver the final segment of Japan's space lab to the International Space Station.

This time the launch of the shuttle must succeed, otherwise it will have to wait for the Russian supply run to the space station, which is scheduled for July 26.