Photos: Solar Impulse makes sixth test flight

The Solar Impulse passes over the Golden Gate Bridge in San Francisco, Calif., during a test flight from Moffett Field in Mountain View on Tuesday, April 23, 2013. Solar Impulse's HB-SIA prototype is making its sixth test flight after being reassembled. The plane will then fly across America in stages over May-July from San Francisco to Washington, D.C., and New York City. (Jean Revillard/Rezo/Solar Impulse/Polaris) ( Solar Impulse Golden Gate flight )

The Solar Impulse, a solar-powered aircraft, is trailed by a helicopter as it flies over the Golden Gate near Sausalito, Calif., on Tuesday, April 23, 2013. (Marin Independent Journal/Alan Dep) ( nmij0424solar )

Solar Impulse's HB-SIA prototype flies over the San Francisco Bay Area while making its sixth test flight from Moffett Field on Tuesday, April 23, 2013, after being reassembled. (Jean Revillard/Rezo/Solar Impulse/Polaris) ( Solar Impulse Golden Gate Flight )

The Solar Impulse soars above the San Francisco Bay Area fog on Tuesday, April 23, 2013, during a test flight. (Jean Revillard/Rezo/Solar Impulse/Polaris) ( Solar Impulse Golden Gate Flight )

San Francisco is seen in the distance as the Solar Impulse takes a test flight from Moffett Field in Mountain View, Calif., over the Bay Area on Tuesday, April 23, 2013. (Jean Revillard/Rezo/Solar Impulse/Polaris) ( Solar Impulse Golden Gate Flight )

The Solar Impulse, a solar-powered aircraft, flies over wisps of fog over the Marin Headlands near Sausalito, Calif., on Tuesday, April 23, 2013. The airplane has a wingspan of more than 200 feet. (Marin Independent Journal/Alan Dep) ( nmij0424solar )

Three planes fly near the solar driven airplane Solar Impulse as it flies over the San Francisco Bay on Tuesday, April 23, 2013. (Doug Duran/Bay Area News Group) ( ssjm0424solar )

The solar driven airplane Solar Impulse flies over the San Francisco Bay on Tuesday, April 23, 2013. (Doug Duran/Bay Area News Group) ( ssjm0424solar )

A bird accompanies the Solar Impulse, the experimental airplane, as it comes in for landing after a test flight at Moffett Airfield in Mountain View, Calif. Friday morning April 19, 2013. (Patrick Tehan/Staff) ( ssjm0420solarrise )

The Solar Impulse, the experimental airplane, comes in for landing after a test flight at Moffett Airfield in Mountain View, Calif. Friday morning April 19, 2013. (Patrick Tehan/Staff) ( ssjm0420solarrise )

Pilot Bertrand Piccard waits for the Solar Impulse, the experimental airplane, to land after a test flight at Moffett Airfield in Mountain View, Calif. Friday morning April 19, 2013. (Patrick Tehan/Staff) ( ssjm0420solarrise )

With Hangar One as a backdrop, the Solar Impulse, the experimental airplane, comes in for landing after a test flight at Moffett Airfield in Mountain View, Calif. Friday morning April 19, 2013. (Patrick Tehan/Staff) ( ssjm0420solarrise )

The Solar Impulse, the experimental airplane, comes in for landing after a test flight at Moffett Airfield in Mountain View, Calif. Friday morning April 19, 2013. (Patrick Tehan/Staff) ( ssjm0420solarrise )

The ground crew tends to the Solar Impulse, the experimental airplane, after it made a test flight at Moffett Airfield in Mountain View, Calif. Friday morning April 19, 2013. (Patrick Tehan/Staff) ( ssjm0420solarrise )

Bertrand Piccard, left, and fellow pilot Andre Borschberg wait for the Solar Impulse, the experimental airplane, to land after a test flight at Moffett Airfield in Mountain View, Calif. Friday morning April 19, 2013. (Patrick Tehan/Staff) ( ssjm0420solarrise )

Andre Borschberg, left, and fellow pilot Bertrand Piccard chat while waiting for the Solar Impulse, the experimental airplane, to land after a test flight at Moffett Airfield in Mountain View, Calif. Friday morning April 19, 2013. (Patrick Tehan/Staff) ( ssjm0420solarrise )

The ground crew tends to the Solar Impulse, the experimental airplane, after it made a test flight at Moffett Airfield in Mountain View, Calif. Friday morning April 19, 2013. (Patrick Tehan/Staff) ( ssjm0420solarrise )

The ground crew moves the Solar Impulse, the experimental airplane, into a hangar after it made a test flight at Moffett Airfield in Mountain View, Calif. Friday morning April 19, 2013. (Patrick Tehan/Staff) ( ssjm0420solarrise )

A bird accompanies the Solar Impulse, the experimental airplane, as it comes in for landing after a test flight at Moffett Airfield in Mountain View, Calif. Friday morning April 19, 2013. (Patrick Tehan/Staff) ( ssjm0420solarrise )