A Japanese firm has proposed a 'luna ring' concept, spanning 6,800 miles around the Moon, potentially powering Earth with solar energy.

A Japanese company proposed a concept of 'luna ring' that would extend about 6,800 miles (11,000 km) around the Moon and reach roughly 250 miles (400 km) in width. Scientists in Japan are looking ...

A Japanese company has come up with a striking idea: build a giant ring of solar panels on the moon and send the energy back ...