The brainchild of Bertrand Piccard and André Borschberg, Solar Impulse 2 (Si2) is the first solar airplane to have achieved an oceanic crossing: 5 days and nights from Nagoya, Japan, to Kalaeloa, Hawaii. Piccard and Borschberg, with aspirations to make Si2 the First Round-The-World Solar Flight, powered only by the sun, with no fuel or polluting emissions, set out to send one, clear message: if an airplane can fly several days and nights in a row with no fuel, then clean technologies can be used on the ground to reduce our energy consumption, and create profit and jobs.

Read: Everything You Need To Know About Solar Impulse 2, The Sun-Powered Plane