Sunstar

The sunstar is a solar powered aircraft that has been in design for the past 28 years.
This vehicle reduces flight cost and is ecological and environmental friendly cause it doesn't run on fuel but solar power.

The SUNSTAR is Solar Flight’s design for the HALE mission. (High Altitude Long Endurance)

It uses the lowest possible power consumption to maintain a flight of very high altitude.
It also has some tech in place for low sunlight and sunangle, which allows it to still utilize the low solar energy.