Earth is our home planet, the only place in the universe where we know for certain that life exists. Earth formed over 4.6 billion years ago from a swirling cloud of gas and dust that gave rise to our entire solar system, including our star, the sun. Scientists hypothesize that this gas and dust collapsed into a disk, with different parts of the disk coalescing into each of the planets in the solar system.In this blog let's know about  our planet earth. 

Our planet sits in a small corner of the Milky Way galaxy, 25,000 light-years from the galactic center, according to NASA. The solar system is situated on a minor arm called the Orion Spur, which branches off from the Sagittarius Arm, one of the galaxy's two major spiral arms.

Earth's circumference is 24,901 miles (40,075 kilometers), making it the largest rocky planet in the solar system. Our planet orbits 93 million miles (150,000 km) away from the sun, giving it the right temperature for persistent liquid water on the surface; it's the only known body to orbit in this so-called Goldilocks zone. 

Earth is composed of many elements, chief among them oxygen, silicon, magnesium, iron, aluminum and nickel, according to Caltech's Infrared Processing and Analysis Center. Our planet's crust is a thin outer layer, containing mostly silicate and basaltic rocks, that extends on average around 18 miles (30 km) below the planet's surface, according to the U.S. Geological Survey(USGS). The mantle is the next layer down, extending to about 1,800 miles (2,900 km) below Earth's surface. A common misconception is that all the rock in the mantle is melted into magma; in reality, most of it is in a highly viscous form that is so thick that it takes millions of years for its movement to become apparent. In Earth's center is a nickel-iron core that is liquid on the outside, down to 1,400 miles (2,250 km), but is crushed by incredible pressures into a solid form at the lowest depths, according to the USGS.

Some interesting facts about earth.. 

- Earth is not flat, but it's not perfectly round either. 

- Earth is special because it is an ocean planet. Water covers 70% of Earth's surface. 

-  Earth is the only place in the known universe confirmed to host life.

Our Earth provides us with everything we want, but also everything we need to survive! Earth provides the food we need for fuel, water we need for hydration, air and the oxygen we breath, raw materials, literally everything we need comes from this one planet.So take care of it..