The milky way slashes across the night sky above a quiver tree (kokerboom, aloe dichotoma) in Richtersveld National Park; South Africa PacificStock
Person standing on a cliff face while the Atlantic Ocean pounds the shores beneath them; Iceland PacificStock
An RC-135 Rivet Joint Reconnaissance aircraft receives fuel from a KC-135 Stratotanker. StocktrekImages
The refueling boom from a KC-135 Stratotanker arches over an F-15 Eagle as it refuels the aircraft. StocktrekImages