The planet known for its bright blue color is Earth. This unique hue primarily results from the vast oceans that cover about 71% of its surface. The blue appearance is due to the absorption and scattering of sunlight by water. Additionally, Earth's atmosphere contributes to its blue appearance when viewed from space due to Rayleigh scattering, which causes shorter blue wavelengths of light to scatter more than other colors. Earth is also distinguished by its rich biodiversity and complex ecosystems, making it the only known planet to support life as we know it.