Earth: The Third Planet from the Sun & Home to Life

Earth is the third planet from the Sun and the only known planet to support life. It has a diameter of approximately 12,742 kilometers and is the fifth largest planet in the solar system. Earth is primarily composed of rock, water, and air, and is home to millions of species of plants and animals. It has an atmosphere that protects life on the planet by shielding it from harmful radiation and provides the air we breathe. The planet is constantly in motion, rotating on its axis once every 24 hours and orbiting the Sun once every 365.25 days. Earth is also unique in that it has a single, large moon that orbits around it.