The planet known for its blue appearance is Earth. From space, Earth distinctly shows a beautiful blue hue primarily due to its vast oceans, which cover about 71% of the planet's surface. The reflection of sunlight off the ocean waters contributes to this visual effect. Additionally, Earth's atmosphere scatters light, particularly shorter blue wavelengths, enhancing the blue appearance. Earth is unique in its ability to support life, with diverse ecosystems and a wide range of climates. This striking blue planet is often referred to as the "Blue Planet" or "Planet Earth" and holds vital significance for life as we know it.