A Solara Cell is a Kryptonian device that creates a miniature yellow sun.
The Solara Cell came to being from among many technologies produced under the Solara Project, led by Saer-El. Initially, the Solara Project was intended to reignite Krypton's sun, Rao, should the time come for it to start to die out. After a few years of research, Saer-El came to realize that reigniting Rao would become a yellow star, allowing the Kryptonians to regain their powers; in which he feared that the return of his people's powers could repeat the terrible wars of the Age of Wars. Saer-El abandoned the Solara Project with permission from the Council of Twelve, and its resulting technologies kept under safe guard by the House of El.