Arinna, a startup founded by two Stanford PhDs, has raised a $4 million seed round to build ultrathin solar panels from a new material developed during their doctoral research. The company, named for the Hittite god of the sun, plans to have its first products tested on orbit by the end of this year and plans to build a facility that can mass produce the material at megawatt scale in 2028. The capital raise was led by SpaceCadet Ventures and participation from Anorak Capital and Breakthrough Energy Foundation. Arinna's ultrathina solar technology allows for extremely flexible cells that are cheaper and more durable than legacy space solar panels. The firm expects its photovoltaics to be far more flexible than traditional panels and 32% more efficient.