Earth is the third planet from the sun and the only astronomical object to harbour life. According to the radiometric dating and other sources of evidence, Earth forms over 4.5 billions years ago. Earth's gravity interacts with other objects in space, especially the Sun and the Moon, which is Earth's only natural satellite. Earth orbits around the Sun in 365.265 days, a period known as an Earth sideral year. During this time, Earth rotates about its axis about 366.265 times. Earth's axis of rotation is tilted with respect to its orbital plane, producing seasons on Earth. The gravitational interaction between Earth and Moon causes tides, stabilizes Earth's orientation on its axis, and gradually slows its rotation. Earth is the densest planet in the Solar System and the largest and most massive of the four rocky planets. Earth's lithosphere is divided into several rigid tectonic plates that migrate across the surface over many millions of years. About 71% of E...
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