Earth is the third closest planet to the Sun in the Solar System and is currently the only astronomical entity known to have life and liquid water on it. According to radiometric dating and other evidence, it is thought to have been created more than 4.5 billion years ago. Earth's gravity interacts with other objects in space, particularly the Sun and its only natural satellite, the Moon. Earth's orbit around the Sun takes 365 solar days or one sidereal year. During this time, the Earth rotates