“NASA's Pathfinder, Pathfinder Plus, Centurion and Helios Prototype were an evolutionary series of solar- and fuel-cell-system-powered unmanned aerial vehicles. AeroVironment, Inc. developed the vehicles under NASA's Environmental Research Aircraft and Sensor Technology (ERAST) program. They were built to develop the technologies that would allow long-term, high-altitude aircraft to serve as “atmospheric satellites”, to perform atmospheric research tasks as well as serve as communications platforms”. – Wikipedia

Photo: The solar-electric Helios Prototype flying wing is flies over the Hawaiian islands of Niihau and Lehua during the first solar-powered test flight July 14, 2001 from the U.S. Navy's Pacific Missile Range Facility on Kauai, HI. The 18-hour flight was a functional checkout of the aircraft's systems and performance in preparation for an attempt to reach sustained flight at 100,000 feet altitude later in the summer. (Photo Courtesy of NASA/Getty Images)

A Burmese monk feeds the seagulls at a Yangon river jetty February 8, 2012 in Yangon, Myanmar. (Photo by Paula Bronstein/Getty Images)

Robert The Bruce's army from The Clanranald Trust during a rehearsal for the Battle of Bannockburn re-enactment performance which will be staged at the Bannockburn Live Event in Bannockburn, the 700th anniversary of the battle, on June 27, 2014. (Photo by Andrew Milligan/PA Wire)

A meteorite burns up in the atmosphere as seen in this photo taken near of Salgotarjan, 109 kms northeast of Budapest, Hungary, late 21 April 2015. The Moon and Venus can be seen on the left. (Photo by Peter Komka/EPA)

A man reacts while having a nasal swab sample taken at a testing and screening facility for the coronavirus, in a hospital in Karachi, Pakistan, Friday, August 21, 2020. (Photo by Fareed Khan/AP Photo)

A statue of a woman made out of glass and rubble that resulted from the Beirut port mega explosion August 04, is placed opposite to the site of the blast in the Lebanese capital's harbour to mark the one year anniversary of the beginning of the anti-government protest movement across the country on October 20, 2020. Hundreds marched in Beirut on the weekend to mark the first anniversary of a non-sectarian protest movement that has rocked the political elite but has yet to achieve its goal of sweeping reform. (Photo by Joseph Eid/AFP Photo)

Revelers celebrate New Years Eve in socially distanced pods at Times Square on December 31, 2020, in New York City. On average, about one million revelers are drawn to the Crossroads of the World to watch performances and celebrate the New Year. This year a limited live audience of about 40 first responders and essential workers will be allowed to watch the New Years' ball drop from a secure area in Times Square. (Photo by David Dee Delgado/Getty Images)

Gabriel Berendo, a businessman and car enthusiast, drives a casket converted into a car on Sunday May 31, 2020 in Cebu city, central Philippines as he goes around streets to remind residents to stay at home as lockdown measures to prevent the spread of the new coronavirus eases next week. (Photo by AP Photo/Stringer)