Earth is the third planet from the Sun. Earth is the only astronomical object known to have life. Radiometric dating and other evidence suggests that Earth formed over 4.5 billion years ago. The Moon is Earth’s only natural satellite. Earth orbits around the Sun every 365.256 days. One rotation around the Sun is known as an Earth sidereal year.
Earth is the third planet from the Sun and the only astronomical object known to harbor life.
