The pole banks the summer in layers and spends it all winter.
An artistic imagining, rendered procedurally, of a seasonal energy bank standing on the layered ice of the Martian north polar cap: the low summer sun charges the row through the collector head on each crown, and the bright level line inside every vessel shows how much of the coming winter is already in hand. Mars really does carry kilometres of layered ice and dust at its poles and months of unbroken polar night; a bank that keeps a whole summer against that dark is speculation.Image: poweringspace.com. Artistic imagining.