The planet known for its intense blue color is Neptune. As the eighth planet from the Sun, it is the farthest in the solar system and is a gas giant composed mainly of hydrogen, helium, and methane. The presence of methane gas in its atmosphere is what gives Neptune its striking blue hue, making it visually distinct from other planets. Neptune has a dynamic atmosphere with strong winds and storm systems, including the Great Dark Spot, a massive storm similar to Jupiter’s Great Red Spot. Discovered in 1846, Neptune remains a subject of scientific interest and exploration.