Planetary Year Lengths: Exploring Time on Other Worlds

The length of a year varies on each planet in our solar system. Mercury has the shortest year, lasting 88 Earth days, while Neptune has the longest, lasting 165 Earth years. The rotation rates of the gas giants are faster than the terrestrial planets, and the planets' orbits are not perfectly circular, resulting in varying speeds throughout their orbits. Kepler's laws of motion explain the relationship between a planet's distance from the Sun and its revolution time. Additionally, the article mentions the rotation periods and axial tilts of each planet, including an honorable mention of Pluto as a dwarf planet.