Solar Impulse awaits 'moment of truth'
In what will be its greatest challenge yet, the zero-fuel aeroplane Solar Impulse will soon try to fly non-stop from China to Hawaii - a journey of more than 8,000km across the Pacific Ocean.In what will be its greatest challenge yet, the zero-fuel aeroplane Solar Impulse will soon try to fly non-stop from China to Hawaii - a journey of more than 8,000km across the Pacific Ocean.