Cloudy sky background. Remixed by rawpixel. https://www.rawpixel.com/image/10714217/cloudy-sky-background-remixed-rawpixelView licenseFalling asteroid background. Remixed by rawpixel. https://www.rawpixel.com/image/10714218/image-background-cloud-galaxyView licenseAmphitheatrum sapientiae aeternae solius verae, Christiano-Kabalisticum, divino-magicum, nec non physico-chymicum… https://www.rawpixel.com/image/13990101/image-white-background-frame-bookFree Image from public domain license