The NASA has cleared space shuttle Discovery for lift-off Tuesday, and the weather is looking even more promising.

After meeting Sunday afternoon, managers decided Discovery is in good flying shape. All of the testing for a replaced shuttle power controller came back favourable.

Forecasters say there is an 80 per cent chance the weather will cooperate for Discovery’s early morning flight to the international space station. That’s better than previous forecasts.

There is a 40 per cent chance that thunderstorms could interfere with Monday afternoon’s fuelling. A delay of more than a couple of hours could stall the launch.

Discovery and seven astronauts will deliver thousands of pounds of space station supplies and equipment.

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