AUSTRALIA gleams a bright red in a map that paints a vibrant picture of how solar energy reaches different parts of the world.
America's space agency, NASA, has pinpointed the world's sunniest spots by studying maps compiled by US and European satellites.
Red shows the regions that receive the most sun, such as the middle of the Pacific Ocean and the Sahara Desert in Niger, followed by orange, yellow, green, blue, purple and pink.
One sun-baked desert landmark in south-east Niger got a searing average of 6.78 kilowatt hours of solar energy per square metre per day from 1983-2005, roughly the amount of electricity used by a typical US home in a day to heat water.
The maps have already been used to help businesses site solar panels in Morocco, or send text messages to tell sunbathers in Italy to put on more sunscreen. The maps could also help guide billions of dollars in solar investments for a world worried by climate change.
University of NSW renewable energy expert Dr Mark Diesendorf said maps such as this not only helped companies interested in building solar power stations but illustrated the energy possibilities of the sun. "Australia has got lots of solar energy potential, and it's not doing enough to tap into that."
Dr Wes Stein, manager of the CSIRO's National Solar Energy Centre, said a 2001 study showed Australia had the highest average solar radiation of any continent. "We are a very good country to do solar energy projects."
The CSIRO hopes to start its own project, incorporating satellite data, to model in detail the spread of solar radiation across the country. "That would give us a very good idea of solar power available in Australia," Dr Stein said.