Solar energy has long been used as a clean alternative to fossil fuels such as coal and oil, but it could only be harnessed during the day when the sun’s rays were strongest. Now researchers led by Tom Meyer at the Energy Frontier Research Center at the University of North Carolina at Chapel Hill have built a system that converts the sun’s energy not into electricity but hydrogen fuel and stores it for later use, allowing us to power our devices long after the sun goes down.
An era of nighttime solar power is dawning in the U.S.
Tigers don't necessarily need huge dedicated reserves, say scientists, but can accommodate themselves to patterns of human activity by becoming more nocturnal.
Satellite images of city lights can be used to monitor outbreaks of disease, says a team led by Princeton University.
Solar Impulse has successfully completed its first night flight, the first solar-powered plane to do so.
The solar powered Impulse HB-SIA has successfully completed its maiden voyage over a picturesque Swiss airfield.