Uranus and Neptune were the first planets to be discovered since ancient times and showed astronomers that the solar system was larger than previously thought. The planet has no rings or moons and is currently being visited by the European Space Agency’s Venus Express spacecraft. Uranus, the only planet that rotates on its size, has 27 known moons. The inner planets are closer to the sun and are smaller and stonier.
The inner planets are closer to the sun and are smaller and stonier. The planet is also a slow rotator with a 243-day Venus day and an orbit around the Sun at 225 days.