A day on Pluto lasts 153 hours, or about 6.4 Earth days. Pluto rotates on its side, tilted 120° relative to its orbit around the sun. This unusual orientation results in extreme seasonal variations. * Explanation -Pluto\'s rotation is retrograde, meaning it spins from east to west, like Venus and Uranus. -Pluto\'s axis of rotation is tilted 57° relative to the plane of its orbit around the sun. -Pluto\'s seasonal variations are extreme because of its unusual orientation. At its solstices, one-fourth of its surface is in continuous daylight, while another fourth is in continuous darkness. Pluto is officially classified as a dwarf planet. It orbits the sun about 3.6 billion miles (5.8 billion km) away on average, about 40 times as far as Earth. Pluto has a thin atmosphere of nitrogen, methane, and carbon monoxide. It also has five moons, including Charon, which is so large that Pluto and Charon orbit each other like a double planet.