The Moon (left) May 12, 1859; (right) Feb. 22, 1858 by Warren De la Rue and Beck and Beck Smith https://www.rawpixel.com/image/14265699/photo-image-frame-plant-spaceFree Image from public domain licenseEight-Spotted Forester (Noctuidae, Alypia octomaculata)USA, TX, Travis Co.: AustinBarton Creek Greenbelt https://www.rawpixel.com/image/8720186/photo-image-plant-leaves-public-domainFree Image from public domain licenseGrasshopper png sticker, transparent background. Free public domain CC0 image. https://www.rawpixel.com/image/8807455/png-white-background-peopleFree PNG from public domain licenseTetradrachm (Coin) Portraying Emperor Probus by Ancient Roman https://www.rawpixel.com/image/8959102/tetradrachm-coin-portraying-emperor-probus-ancient-romanFree Image from public domain licenseJewel Beetle (Coleoptera, Buprestidae)USA, TX, Trinity Co.: LufkinDavy Crockett National ForestA. Santillana coll. https://www.rawpixel.com/image/8724154/photo-image-public-domain-animalFree Image from public domain licenseSolar system illustration. Remixed by rawpixel. https://www.rawpixel.com/image/10208637/solar-system-illustration-remixed-rawpixelView licenseDe maan (c. 1857 - c. 1862) by Warren de la Rue and Beck and Beck Smith https://www.rawpixel.com/image/13758453/maan-c-1857-1862-warren-rue-and-beck-and-beck-smithFree Image from public domain licenseA surgeon attending to a man's arm. Oil painting after Adriaen Brouwer. https://www.rawpixel.com/image/14011973/surgeon-attending-mans-arm-oil-painting-after-adriaen-brouwerFree Image from public domain license