Hawaii: In silence, without using a drop of fuel, but with much wonder in the eyes of hundreds of enchanted supporters, Solar Impulse 2 (Si2) took off early this morning at 6:15am Hawaii time (UTC-10) to complete the crossing of the Pacific. Si2, the solar airplane of Bertrand Piccard and André Borschberg, capable of flying day and night powered only by the energy of the sun, will be airborne during Earth Day – a powerful symbol, and is expected to land at the Moffett Airfield in Mountain View, California, on April 23. The flight, that should take three days depending on weather conditions, will be another challenging leg of the Round-The-World Solar Flight.