Business Green: As the sun sets over the Swiss Alps this evening those taking in the breathtaking view may also catch a glimpse of an aircraft making a journey of genuine historic significance. The Solar Impulse project is today staging the first ever attempt to fly a solar-powered plane through the night, taking the research initiative a major step closer to its aim of staging a round the world solar-powered flight. The Solar Impulse plane took off from the Payerne airbase at 06:51 this …