In our previous article titled SUN : THE MOST MASSIVE BODY IN OUR SOLAR SYSTEM
, we shared interesting facts about our source of energy - the SUN. Today, we explore our own planet - the Earth and will tell you how the earth was born. Cannot wait to know about your planet? Lets start with the Big Bang.
Universe as we all know was created with a big bang around 13 billion years ago. It includes planets, stars, galaxies and moons. We are also the part of one such galaxy known as Milky Way. Around 4.6 billion years ago, our solar system was a cloud of dust and gases called solar nebula. Due to gravitational forces this material began to rotate, and created sun in the center of that nebula.
With the formation of sun, the remaining smaller atoms clustered and transformed into heavy elements in stellar explosions. The lighter elements or gases such as hydrogen and helium were carried away with solar wind from closer area of the sun. Only heavy, rocky and metallic material left that created smaller terrestrial planets like Mercury, Venus, Earth and Mars. Earth is the third planet in the solar system and its age is around one third of the age of universe.
Earth is the biggest and densest terrestrial planet among all the inner planets. At the early time the earth was in molten form because of the collision and attraction of heavy components. Over time the earth cooled, making the rocky core by the movement of thick and dense materials towards the center and lighter elements upwards making the crust of the earth and allowing water on the surface. Then the magnetic field created and grew slowly as the time passed. After that the gases were attracted due to gravity to form the early atmosphere of the earth.
The shape of our earth is oblate spheroidal. That means it is flattered along its axis and expanding around the equator. The diameter of the earth at the equator is 43 kilometers larger than the all-round diameter. The total mass of the earth is around 5.97*1024 kg. The main components of earth are iron, oxygen, silicon, magnesium and sulfur. From inner core to outer most crust the earth is divided into many layers due to different chemical and physical properties of chemicals. Due to plenty of water on the outer surface earth is also known as â€œBlue Planetâ€.
The facts that make our earth unique in whole universe are:
- Till now Earth is the only planet where the life is known to exit.
- Only earth is known to have geological activities.
- Liquid hydrosphere is another fact that makes it unique.
- Plate tectonics is observed only on earth.
- Moon is the only natural satellite of earth among all the terrestrial planets.
- Only earthâ€™s atmosphere contains 21% free oxygen.
- Constant changes occurring inside and outside earth.
The formation was just the beginning since then our earth has under gone through massive geological changes. These changes like shifting of continents, creation of mountains and oceans are happening because of plate tectonics and erosion. From the beginning, heat and gravity formed the evolution of earth and these changes resulted in the origination of life on this planet.
Exploring the past is the only possibility of understanding the origin of life and, perhaps, its future. We will keep on exploring more and sharing the same with you in upcoming articles. Stay tunedâ€¦