A. Mars
B. Neptune
C. Jupiter
D. Earth
🧠 Explanation:
Neptune, the outermost planet, orbits the Sun in 164.8 years, the longest in the solar system. Its distance of 4.5 billion kilometers causes lengthy seasons, lasting over 40 years. This ice giant, with a methane-blue atmosphere, features storms and faint rings. Discovered in 1846, it’s 17 times Earth’s mass. Neptune’s slow orbit emphasizes the solar system’s vastness, intriguing scientists. Its unique features, like the Great Dark Spot, make it a focal point in planetary studies, offering insights into the dynamics and composition of distant worlds in our cosmic neighborhood.