Aurora borealis, Upper Geyser Basin. Original public domain image from Flickr https://www.rawpixel.com/image/4039503/photo-image-background-green-spaceFree Image from public domain licenseU.S. Army Air Assault students practice rappelling out of a Black Hawk helicopter on day nine of Air Assault School’s… https://www.rawpixel.com/image/3315430/free-photo-image-aircraft-silhouette-people-armyFree Image from public domain licenseCityscape building png silhouette border, transparent background. Remixed by rawpixel. https://www.rawpixel.com/image/9801477/png-shadow-borderView licenseEnjoying the Milky Way, Mammoth Hot Springs. Original public domain image from Flickr https://www.rawpixel.com/image/4039521/photo-image-background-star-personFree Image from public domain licenseFree airplane flying during sunset image, public domain aircraft CC0 photo. https://www.rawpixel.com/image/5919507/photo-image-background-clouds-lightFree Image from public domain licensePoolees with Recruiting Station Lansing participate in a morning motivational run at Fort Custer near Battle Creek… https://www.rawpixel.com/image/3579005/free-photo-image-protest-battle-creekFree Image from public domain licenseU.S. Soldiers with Charlie Company, 1st Battalion, 21st Infantry Regiment, 2nd Stryker Brigade Combat Team, 25th Infantry… https://www.rawpixel.com/image/3315637/free-photo-image-news-work-armyFree Image from public domain licenseEarly morning city traffic at sunrise. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3285151/free-photo-image-city-background-red-light-human-silhouetteFree Image from public domain licenseMilky Way from the Commissary Ridge Spike Camp during the Fall Creek RX. Caribou-Targhee National Forest, USA. Original… https://www.rawpixel.com/image/4035086/photo-image-stars-space-natureFree Image from public domain licenseFree horse silhouette during sunset image, public domain animal CC0 photo. https://www.rawpixel.com/image/5901926/photo-image-public-domain-nature-blackFree Image from public domain licenseMilky way over Silex Spring runoff. Original public domain image from Flickr https://www.rawpixel.com/image/4032634/photo-image-background-stars-woodsFree Image from public domain licenseU.S. Air Force active duty and Air National Guard firefighters find their way through a simulated building fire during a… https://www.rawpixel.com/image/3388521/free-photo-image-cc0-creative-commonsFree Image from public domain licenseWoman holding a thread of light near a lake. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3283796/free-photo-image-night-landscape-cc0-creative-commonsFree Image from public domain licensePhotograph - New York [From the Viaduct, Shadows] by Paul Strand https://www.rawpixel.com/image/14263010/photograph-new-york-from-the-viaduct-shadows-paul-strandFree Image from public domain licenseHand holding sparklers. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3286194/free-photo-image-colourful-spark-fun-bokehFree Image from public domain licenseMilky Way at the Square Tower Group at Hovenweep. Original public domain image from Flickr https://www.rawpixel.com/image/4035145/photo-image-light-stars-spaceFree Image from public domain licenseBlack road bike on against black background. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3283281/free-photo-image-bicycle-bike-cc0Free Image from public domain licenseFactory Chimney Smoke. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3285480/free-photo-image-smoke-black-background-pollutionFree Image from public domain licenseDog catching a ball. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3286563/free-photo-image-black-and-white-catchFree Image from public domain licenseFree silhouette of people at airport terminal image, public domain people CC0 photo. https://www.rawpixel.com/image/5919763/photo-image-public-domain-person-freeFree Image from public domain licenseBirds flying in a golden sky. Early one morning, as the day was dawning. Original public domain image from Flickr https://www.rawpixel.com/image/4021601/photo-image-background-bird-natureFree Image from public domain licenseSilhouette of people standing inside Haleakala Observatory watching the sunset through the windows. Original public domain… https://www.rawpixel.com/image/3282771/free-photo-image-america-architecture-buildingFree Image from public domain licenseThe silhouette of a person riding a skateboard with orange wheels at sunset at University of Northern Iowa. Original public… https://www.rawpixel.com/image/3285170/free-photo-image-skate-human-activity-road-personFree Image from public domain licenseThe setting sun silhouettes the amphibious assault ship USS Makin Island (LHD-8) under way off the coast of Southern… https://www.rawpixel.com/image/3315504/free-photo-image-military-aircraft-navalFree Image from public domain licenseA long exposure shot of a star-filled night sky, featuring silhouette trees and hills. Original public domain image from… https://www.rawpixel.com/image/3284794/free-photo-image-star-sky-background-hillsFree Image from public domain licenseConstruction Workers Silhouetted Against A Bright October Sun In South Side Chicago, 10/1973. Photographer: White, John H.… https://www.rawpixel.com/image/8799438/photo-image-light-public-domain-sunlightFree Image from public domain licenseFree 2 German shepherd dog standing at dawn image, public domain animal CC0 photo. https://www.rawpixel.com/image/5924755/photo-image-background-public-domain-dogFree Image from public domain licenseSilhouetted windmill in Texas. Original image from Carol M. Highsmith’s America, Library of Congress collection.… https://www.rawpixel.com/image/3094487/free-photo-image-windmill-trees-americaFree Image from public domain licenseRuins of Haxalls (Or Gallego) Mills, Richmond, Virginia. (Taken in April, 1865) by Mathew Brady. Original public domain… https://www.rawpixel.com/image/8800003/photo-image-art-vintage-smokeFree Image from public domain licenseFree Eiffel Tower light up at night image, public domain building CC0 photo. https://www.rawpixel.com/image/5922102/photo-image-public-domain-art-blackFree Image from public domain licenseOn the Staten Island Ferry, Looking Back Toward the Skyline of Lower Manhattan. To the Left of the Cluster of Buldings Are… https://www.rawpixel.com/image/8800165/photo-image-sky-public-domain-peopleFree Image from public domain licenseA silhouette of a person pushing a cart with cardboard boxes. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3286678/free-photo-image-box-cc0-creative-commonsFree Image from public domain licenseShorebird wading in Upper Newport Bay, near Newport Beach. Original public domain image from Flickr https://www.rawpixel.com/image/8799622/photo-image-sunset-sky-public-domainFree Image from public domain licensePNG Decorative ornamental leaf with cupid, illustration by Henry T. Williams, transparent background. Remixed by rawpixel. https://www.rawpixel.com/image/10149260/png-face-artView licenseU.S. Navy Boatswain’s Mate Seaman Lucas Robinson updates the status board in the pilot house aboard the guided-missile… https://www.rawpixel.com/image/8729621/photo-image-public-domain-ocean-mathematicsFree Image from public domain licenseFree dandelion silhouette at sunset image, public domain nature CCO photo. https://www.rawpixel.com/image/5926328/photo-image-public-domain-leaves-plantFree Image from public domain licenseSunset On The Potomac, September 1973. Photographer: Swanson, Dick. Original public domain image from Flickr https://www.rawpixel.com/image/8799588/photo-image-public-domain-ocean-personFree Image from public domain licenseMidtown Skyline of New York City Seen From Queens. Original public domain image from Flickr https://www.rawpixel.com/image/8799451/photo-image-smoke-light-sunsetFree Image from public domain licenseTwilight colors fill the sky, as harvesters turn on their lights and work into the evening, during the Ernie Schirmer Farms… https://www.rawpixel.com/image/3259389/free-photo-image-tractor-work-agricultureFree Image from public domain licenseFarm windmill outlined against setting sun near Seward. Original public domain image from Flickr https://www.rawpixel.com/image/8799713/photo-image-light-sunset-skyFree Image from public domain licenseFree silhouette of man running in forest photo, public domain nature CC0 image. https://www.rawpixel.com/image/5908225/image-public-domain-tree-natureFree Image from public domain licensePeople, human with nature scenery photo, free public domain CC0 image. https://www.rawpixel.com/image/5923386/photo-image-background-public-domain-natureFree Image from public domain licenseAmerican egrets roosting and nesting on the Colorado River Indian Reservation near Parker. Original public domain image from… https://www.rawpixel.com/image/8799712/photo-image-public-domain-bird-flamingoFree Image from public domain licenseU.S. Soldiers from the 4th Brigade Combat Team, 25th Infantry Division search for a missing Soldier in the Ghazni province… https://www.rawpixel.com/image/3315571/free-photo-image-adventure-afghanistan-air-assaultFree Image from public domain licenseTransmission lines and railroad near Salton Sea. District of Los Angeles smog obscures the sun, May 1972. Photographer:… https://www.rawpixel.com/image/8799578/photo-image-light-sunset-skyFree Image from public domain licenseMauna Loa glows with hot lava during peak of eruption. Trees in foreground were killed by earlier eruptions, November 1973.… https://www.rawpixel.com/image/8799709/photo-image-plant-moon-spaceFree Image from public domain licenseNorwood Farms owners and producers Don and son Grant Norwood work with U.S. Department of Agriculture (USDA) Farm Production… https://www.rawpixel.com/image/3259356/free-photo-image-silo-architecture-buildingFree Image from public domain licenseSunset does not stop the harvest operation; lights come on and GPS will guide the harvester along the rows, during the Ernie… https://www.rawpixel.com/image/3306983/free-photo-image-farm-transportation-construction-architectureFree Image from public domain licenseFarm youngsters playing at sunset near their home in Ripley, May 1972. Photographer: O'Rear, Charles. Original public domain… https://www.rawpixel.com/image/8799566/photo-image-light-sunset-skyFree Image from public domain licenseFish-Counting Station with Public Viewing Windows Under Construction at Bonneville Dam. This Will Replace Old Fish Ladders… https://www.rawpixel.com/image/8765615/photo-image-vintage-light-shadowFree Image from public domain licenseMilitary Working Dog, U.S. Army Sergeant Astor P720, assigned to 92nd Military Police Company, obediently sits and waits for… https://www.rawpixel.com/image/8729549/photo-image-sunset-sky-public-domainFree Image from public domain license