A solar plane attempting to fly around the world without a drop of fuel plans to make an unscheduled stop this afternoon in Japan because of bad weather.

Swiss pilot André Borschberg took off from Nanjing in China yesterday on what was to be the longest leg of the journey, a six-day flight to Hawaii.

Instead, the Solar Impulse 2 will land in Nagoya - and wait for better conditions.

The journey started in March in Abu Dhabi.

The Solar Impulse 2 aircraft is propelled solely by the sun's energy through more than 17,000 solar cells.

The flight is being undertaken as part of the Future is Clean campaign, which is looking to raise awareness of clean energy sources and technologies.