A day on the planet Neptune is approximately 16 hours, according to NASA. It is the farthest non-dwarf planet in the solar system from the Sun. It takes Neptune approximately 165 Earth years to orbit the Sun.
Neptune is the eighth planet in the solar system, and it is nearly 2.8 billion miles from the Sun, according to NASA. Neptune has six rings that circle it and 13 confirmed moons. Neptune has no solid surface, as it is a gas giant. In the summer of 1989, Voyager 2 became the first spacecraft to visit Neptune. Neptune was discovered in 1846.