Planes have flown using the electricity from solar panels even on cloudy 20 days, and solar-powered vehicles improve every year. In space, converting sunlight into electricity is easier than it is on the Earth, as there is no atmosphere to reduce the strength of sunlight. Vital communications satellites depend totally on solar panels as do manned space stations and robots exploring tho surfaces of planets. In the future we will get used to seeing solar panels other 25 everywhere.