2017 Total Solar Eclipse. Original from NASA. Digitally enhanced by rawpixel. Free Image from public domain license 
An illustration of a supermassive black hole. Original from NASA. Digitally enhanced by rawpixel. Free Image from public domain license 
Hubble Nets a Subtle Swarm. This Hubble image shows NGC 4789A, a dwarf irregular galaxy in the constellation of Coma… Free Image from public domain license