Earth
Earth is the third planet from the Sun and is the only known planet in the universe that supports life. It has a diameter of about 12,742 kilometers. Earth has a unique atmosphere that is composed of nitrogen, oxygen, and trace amounts of other gases, which protects the planet and supports a diverse array of life forms. It also has a magnetic field that protects the planet from harmful solar radiation. The planet has a diverse range of ecosystems, including forests, oceans, deserts, and polar regions, and is home to millions of species of plants and animals.
