Neptune is an ice giant, composed primarily of hydrogen, helium, and methane, with a hot, dense fluid of icy materials above a small rocky core. Neptune has 14 known moons and at least five main rings ...

In January 2025, Venus, Mars, Jupiter, Saturn, Uranus and Neptune were all visible in the night sky. And in February, 2025, Mercury will join the fun, with all seven of our planetary neighbors visible ...

But Uranus and Neptune don't. Instead ... There are numerous proposals for spacecraft to visit both worlds, and the furthest along is a mission concept called the Uranus Orbiter and Probe.