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Delving into Earth's fascinating details, our planet boasts a radius of 6,371 kilometers, making it the largest terrestrial planet and the fifth-largest in our solar system. Earth is situated at exactly one astronomical unit (150 million kilometers) from the Sun, a figure that defines the Earth-Sun distance. It takes approximately eight minutes for sunlight to reach our planet, traveling at a speed of roughly 300,000 km/s. Formed around 4.5 billion years ago, Earth came into existence as gravity aggregated gas and dust in the solar system. Like its terrestrial counterparts, Earth has a central core, a rocky mantle, and a solid crust. As it orbits the Sun, Earth rotates on its axis every 23.9 hours and takes 365.25 days to complete a full revolution. The additional 0.25 day is accounted for every four years with a leap year . Earth's axial tilt of 23.4 degrees from its orbital plane causes the annual cycle of seasons, offering us a unique position in the vast universe.
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