7. URANUS Uranus is the seventh planet from the Sun. Oddly, it spins on its side. Here’s the last picture of Uranus taken by Voyager II (launched in 1981) after it left for Neptune. It’s the only Uranian visit by a human spacecraft so far. Uranus does have clouds – thought to be made up of water and methane. Uranus has twenty-seven moons. These are the six major ones – Puck, Miranda, Ariel, Umbriel, Titania, and Oberon. Uranus spins on its axis about every seventeen hours. But in retrograde – meaning in the opposite direction that Earth and most other planets spin. In fact the only other retrograde planet is Venus.