The planet known for its blue color and often referred to as the "Blue Planet" is Earth. This nickname arises from the significant portion of the Earth's surface covered by oceans, which appear blue when viewed from space. The blue hue is also due to the way water absorbs and scatters sunlight. Earth's abundance of water not only contributes to its striking visual appearance but also supports a diverse range of ecosystems, making it unique among planets in our solar system. Additionally, Earth is the only known planet to sustain life, further accentuating its distinction as the "Blue Planet."