Solar Power (IMAGE) U.S. National Science Foundation Caption Scientists participating in Caltech's Chemical Bonding Center project, called "Powering the Planet," are researching the efficient and economical conversion of water and solar energy into the chemical fuels of hydrogen and oxygen. These fuels may be used as a source of energy after the sun goes down and to generate a carbon-neutral or oil-free source of energy scalable to meet future global energy demands. Credit 123 Royalty Free, http://www.123rf.com/ Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.