The Planet of Doubt Jupiter and Saturn and on the surface of Uranus itself. At the time "The Planet of Doubt" takes place at the turn of the 22nd century, the limited range of the spaceships ensures that Uranus can only be reached from the American base on Titan when Saturn reaches conjunction with Uranus, an event that occurs once every forty years. The Young expedition explored the planet's south pole in 2060; now Hammond takes his ship, the "Gaea", to the north pole. Finding an ocean at the north pole, Hammond sends the "Gaea" spiraling southeast until they reach land. They find the
NASA Uranus orbiter and probe of depth. The probe would be 30 kg in mass and about 0.5m in diameter. There is also a study that recommended a medium-class concept for the New Frontiers program to develop such an orbiter for Uranus. NASA Uranus orbiter and probe A Uranus orbiter and probe is a mission concept for study of the planet Uranus. It was first recommended to NASA in 2011 by its Planetary Science Decadal Survey 2013–2022. NASA evaluated in 2017 twenty different mission designs submitted by the scientific community, considering mission trades, trajectories, and the technology required for specific objectives. Because of planet position