The solar observatory on Lomnicky Stit, in Slovakia’s High Tatras range, on Thursday. The station is one of five worldwide which observe emission spectral lines in the sun’s corona.
The world’s largest solar-powered boat, “MS Turanor PlanetSolar” sails through the Corinth Canal near the town of Corinth on Monday. The boat arrived to Greece as part of a joint archaeological project focused on underwater exploration off one of Europe’s oldest human occupation sites, the Franchthi cave in the Argolid, southeast Peloponnese
The experimental aircraft “Solar Impulse 2″, HB-SIB, during solar generator tests at an air base in Payerne, Switzerland, on Monday. The project aims to achieve the first circumnavigation of the world with an aircraft powered only by solar energy.
Solar Impulse, piloted by André Borschberg, takes flight during the second leg of the 2013 Across America mission at dawn on Wednesday from Sky Harbor International Airport in Phoenix, Arizona.
Stargazer delight: a man takes in the beautiful spectacle of the unusually clear night sky over Kielder Water, Northumberland, northeast England, on Tuesday