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The unveiled Solar Impulse II aircraft is seen at their base in Payerne
The unveiled Solar Impulse II aircraft is seen at their base in Payerne April 9, 2014. The new solar powered aircraft weighs 2.4 tons with a wingspan of 72 meter and more than 17,000 solar cells. REUTERS/Denis Balibouse (SWITZERLAND - Tags: TRANSPORT ENVIRONMENT)
The unveiled Solar Impulse II aircraft is seen at their base in Payerne
The unveiled Solar Impulse II aircraft is seen at their base in Payerne April 9, 2014. The new solar powered aircraft weights 2.4 tons with a wingspan of 72 meter and more than 17,000 solar cells. REUTERS/Denis Balibouse (SWITZERLAND - Tags: TRANSPORT ENVIRONMENT)
The unveiled Solar Impulse II aircraft is seen at their base in Payerne
The unveiled Solar Impulse II aircraft is seen at their base in Payerne April 9, 2014. The new solar powered aircraft weights 2.4 tons with a wingspan of 72 meter and more than 17,000 solar cells. REUTERS/Denis Balibouse (SWITZERLAND - Tags: TRANSPORT ENVIRONMENT)
Swiss Defence Minister Maurer speaks during the official unveiling ceremony of the Solar Impulse II aircraft at their base in Payerne
Swiss Defence Minister Ueli Maurer speaks during the official unveiling ceremony of the Solar Impulse II aircraft at their base in Payerne April 9, 2014. The new solar powered aircraft weights 2.4 tons with a wingspan of 72 meter and more than 17,000 solar cells. REUTERS/Denis Balibouse (SWITZERLAND - Tags: TRANSPORT ENVIRONMENT POLITICS)
Swiss Defence Minister Maurer speaks during the official unveiling ceremony of the Solar Impulse II aircraft at their base in Payerne
Swiss Defence Minister Ueli Maurer speaks during the official unveiling ceremony of the Solar Impulse II aircraft at their base in Payerne April 9, 2014. The new solar powered aircraft weights 2.4 tons with a wingspan of 72 meter and more than 17,000 solar cells. REUTERS/Denis Balibouse (SWITZERLAND - Tags: TRANSPORT ENVIRONMENT POLITICS)