The NASA and German Aerospace Center SOFIA airborne infrared observatory took flight for the first time from its… https://www.rawpixel.com/image/440749/free-photo-image-airplane-plane-aerospaceFree Image from public domain licenseKatie Patterson, a U.S. Army wounded veteran of Indianapolis, competes in the 100-meter breast stroke during the 31st… https://www.rawpixel.com/image/8742346/photo-image-face-trees-public-domainFree Image from public domain license150902-N-ZZ999-002 CAPE CANAVERAL, Fla. (Sept. 2, 2015) The U.S. Navy's fourth Mobile User Objective System (MUOS)… https://www.rawpixel.com/image/8728375/photo-image-space-light-public-domainFree Image from public domain licensePortrait of America. No. 36. Rural electrification in the U.S. This collection of electric meters, receiving a final… https://www.rawpixel.com/image/12242923/photo-image-face-person-artFree Image from public domain licenseAneroid barometer published by Robinson, Son & Pike (1872). Original from the British Library. Digitally enhanced by… https://www.rawpixel.com/image/561141/aneroid-barometer-vintage-styleFree Image from public domain licenseLogos of NASA and the German Aerospace Center (DLR) are displayed prominently on the tail of the Stratospheric Observatory… https://www.rawpixel.com/image/440735/free-photo-image-flight-plane-tail-airplaneFree Image from public domain license[Untitled photo shows: Jesse Owens and teammate competing in the 400 meter relay at the Berlin Olympics, 1936]. Sourced from… https://www.rawpixel.com/image/12306314/image-people-public-domain-manFree Image from public domain licenseAneroid barometer published by Robinson, Son & Pike (1872). Original from the British Library. Digitally enhanced by… https://www.rawpixel.com/image/561170/aneroid-barometer-vintage-styleFree Image from public domain licenseAneroid barometer from published by Henry Herbert (1872). Original from the British Library. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/572906/aneroid-barometer-vintage-drawingFree Image from public domain licenseAneroid barometer from published by Henry Herbert (1872). Original from the British Library. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/573007/aneroid-barometer-vintage-drawingFree Image from public domain licenseAneroid barometer published by Robinson, Son & Pike (1872). Original from the British Library. Digitally enhanced by… https://www.rawpixel.com/image/561145/aneroid-barometer-vintage-styleFree Image from public domain licenseLouis Paulhan in zijn vliegtuig tijdens een vlucht (waarschijnlijk tijdens de 1910 Los Angeles International Air Meet)… https://www.rawpixel.com/image/13758772/photo-image-paper-space-aeroplaneFree Image from public domain licenseNREL,-owned electric vehicles (EVs) below solar canopy at the Vehicle Testing & integration Facility (VTIF), where vehicles… https://www.rawpixel.com/image/3325656/free-photo-image-car-charging-station-alloy-wheel-automobileFree Image from public domain licenseAirspeed indicator clipart illustration vector. Free public domain CC0 image. https://www.rawpixel.com/image/10165713/vector-illustrations-public-domain-greenFree Vector from public domain licenseThe entrance of Forever Grateful Ranch where owner Jim Chew grows pistachios, in Chowchilla, CA, about 150 miles east… https://www.rawpixel.com/image/3260587/free-photo-image-wood-wooden-coat-rack-agrabilityFree Image from public domain licenseCar gauge clip art. Free public domain CC0 image. . Free public domain CC0 image. https://www.rawpixel.com/image/7685363/image-people-illustrations-public-domainFree Image from public domain licenseParking Meter Checker Stands by His Police Vehicle Which Is Imprinted with the German Word for Police (Polizei). https://www.rawpixel.com/image/8770256/photo-image-person-sunglasses-musical-instrumentFree Image from public domain licenseLint van crèmekleurig gaas van 8 meter (c. 1900 - c. 1915) by Gustav Schnitzler and anonymous https://www.rawpixel.com/image/13748776/image-tape-wood-public-domainFree Image from public domain licenseCounty agent and farmer looking at electric meter on farm, Grundy County, Iowa. Sourced from the Library of Congress. https://www.rawpixel.com/image/12313301/image-hand-people-public-domainFree Image from public domain licenseThe Yosemite Valley from Inspiration Pt. Mariposa Trail / [General View of the Valley - from Inspiration Point] by Carleton… https://www.rawpixel.com/image/14275501/photo-image-plant-tree-mountainFree Image from public domain licenseColosseum, Meter Sudans & Arch of Constantine, Rome by Jane Martha St John https://www.rawpixel.com/image/14318791/colosseum-meter-sudans-arch-constantine-rome-jane-martha-johnFree Image from public domain licenseExterieur van tweede Britse telegraafpost in Juna op 427 meter hoogte (1903 - 1906) by D T Dalton https://www.rawpixel.com/image/13759074/photo-image-frame-art-crossFree Image from public domain licenseConversion. Copper and brass processing. Many parts and products used by the Army and the Navy must stand up under severe… https://www.rawpixel.com/image/12306864/image-person-technology-factoryFree Image from public domain license[Untitled photo, possibly related to: County agent and farmer looking at electric meter on farm, Grundy County, Iowa].… https://www.rawpixel.com/image/12313158/image-person-public-domain-manFree Image from public domain licenseU.S. Army Lt. Col. Dave O'Hearn waits for the pass from U.S. Army Sgt. 1st Class Brant Ireland in the 400 meter relay during… https://www.rawpixel.com/image/8741361/photo-image-public-domain-personFree Image from public domain license[Untitled photo, possibly related to: County agent and farmer looking at electric meter on farm, Grundy County, Iowa].… https://www.rawpixel.com/image/12313156/image-face-person-public-domainFree Image from public domain licenseLint van crèmekleurig gaas van 6 meter (c. 1900 - c. 1915) by Gustav Schnitzler and anonymous https://www.rawpixel.com/image/13747532/image-public-domain-gray-background-knifeFree Image from public domain license