This week's Question: Solar Impulse 2, a solar-powered airplane, completed a risky, 62-hour flight across a wide expanse of the Pacific Ocean. According to pilot and Swiss engineer Andre Borschberg, the plane now has the ability, in theory, to fly for an unlimited period, with only the human factor limiting how long the plane could potentially stay on the air.

What do you think? Could a solar-powered airplane be commercially viable?  

What do you think?