Solar Impulse mission control has described this moment as intense because it's when everyone involved in the project learns whether the experimental aircraft can once again be powered by the sun alone.
Solar Impulse II left Spain for Cairo, Egypt with pilot André Borschberg at the controls early Monday morning.
It is Borschberg's last time flying Solar Impulse on its epic, history-making flight. The flight from Seville International Airport to Cairo International Airport is expected to last 50 hours and 30 minutes.
The aircraft's next -- and last -- flight on its around-the-world odyssey will be from Cairo to Abu Dhabi in the United Arab Emirates, the starting point for the never-before-attempted voyage and its long-awaited finish line.
The plane arrived in Seville on June 23 after an unprecedented three-day flight across the Atlantic.
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