When a star runs out of hydrogen fuel in its core, it expands into a bloated red giant. (discovermagazine.com)
This process could revolutionize the development of hydrogen fuel cells by providing an effective, safer mode of transportation and storage for the volatile gas. (treehugger.com)
According to theory, that is the kind that should be generated by the nuclear fusion of hydrogen in the sun. (discovermagazine.com)