3 - Earth(otherwise known as the world[n 5 in Greek Gaia[n...

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Earth (otherwise known as the world , [n 5] in Greek : Γα α Gaia , [n 6] or in Latin : Terra [26] ) is the third planet from the Sun , the densest planet in the Solar System , the largest of the Solar System's four terrestrial planets , and the only astronomical object known to harbor life . According to radiometric dating and other sources of evidence, Earth formed about 4.54 billion years ago. [27] [28] [29] Earth gravitationally interacts with other objects in space, especially the Sun and the Moon . During one orbit around the Sun, Earth rotates about its own axis 366.26 times, creating 365.26 solar days or one sidereal year . [n 7] Earth's axis of rotation is tilted 23.4° away from the perpendicular of its orbital plane , producing seasonal variations on the planet's surface within a period of one tropical year (365.24 solar days). [30] The Moon, Earth's only permanent natural satellite , by its gravitational relationship with Earth, causes ocean tides, stabilizes the orientation of Earth's rotational axis, and gradually slows Earth's rotational rate.
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