The planet known for its blue color due to the presence of methane is Neptune. Neptune is the eighth planet from the Sun and is classified as an ice giant. Its striking blue hue comes from methane gas in its atmosphere, which absorbs red light and reflects blue light back into space. Neptune is characterized by its dynamic weather patterns, including high-speed winds and storms. Discovered in 1846, it stands as a symbol of the unknown in our solar system, with its unique features intriguing astronomers and scientists alike.