The planet known for its blue color due to water is Earth. Approximately 71% of Earth's surface is covered by water, primarily in the form of oceans, seas, and lakes, which gives the planet its distinctive blue appearance when viewed from space. The vast expanse of water plays a vital role in supporting life and regulating climate. Earth's atmosphere also contributes to its blue color, as scattered sunlight creates a spectrum that enhances the appearance of the oceans. This unique combination of water and atmospheric conditions fosters a diverse array of ecosystems, making Earth the only known planet to support life.