Over the last couple of years, planetary scientists have been increasingly calling for a mission to a largely unexplored region of the solar system: Uranus and its moons.
Planetary scientists know that some of Jupiter's and Saturn's moons likely possess subsurface liquid-water oceans. These "ocean worlds," such as the Jovian moon Europa and the Saturnian moon Enceladus, are not in the "Goldilocks zone" — the optimal distance from a star where liquid water can exist on a world's surface — that was previously thought to be a requirement for habitability.
