What factors contribute to the unique blue color of Neptune?


Neptune's distinct blue hue is primarily due to the absorption of red light by methane in its atmosphere. While the planet is composed of hydrogen, helium, and methane, it's the methane that plays a pivotal role in giving Neptune its color. Methane molecules absorb red light and scatter blue light back into space, resulting in the deep blue appearance we associate with the planet. Additionally, unknown compounds might contribute to enhancing the vivid blue coloration of Neptune.