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Earth

How Earth was formed, its history, its present and how humans might affect its future   

 Dr. Abhinandan Bhardwaj PhD

 

Our home planet Earth is a wondrous place. If you look at it from space it is one of the most beautiful planet in our solar system and looks like a bright blue marvel orbiting around the sun. Its only the most beautiful but most fascinating as well as its the only known planet thus far which can sustain life. Earth was born as a run-of-the- rocky sphere orbiting a fairly average star, a series of lucky breaks have turned Earth into a hospitable, ever changing planet with a huge variety of landscapes and habitats. Earth is the largest of the solar system's terrestrial planet's.

Like many of the other planets, Earth's axis of rotation is titled to its orbit, so instead of spinning around the Sun in an upright position, our planet is instead titled over at an angle of 23.5 degrees from vertical. The Earth's tilt points in the same direction in space regardless of its position on its orbit round the Sun, so different regions of the planet receive differing amounts of sunlight throughout the year. This gives rise to the seasons on Earth.

 

How Earth Formed Watch Video

i Save EarthAir And Water

While most of our planet is composed of rocky materials similar to those found in other terrestrial planets, they are capped by unique thin layer of water and gas known as hydrosphere and atmosphere. These elements helps shape the environment and the continents with the help of forces of tectonics. Earths atmosphere and surface water can survive because of its unique position in the solar system. Earth's fast rotation rate prevents one side of the planet from becoming boiling hot while the other from deep freeze, and a moderate axial tilt ensures that both poles receives a reasonable amount of sunlight throughout the year, preventing them from extending their icy grasp towards the equator. All these factors combine to create a planet where the surface temperature generally is between the freezing and boiling points of water.  You can call it a mere coincidence but this coincidence of the temperature would be meaningless if Earth had no atmosphere. Without atmosphere liquid water would simply boil off into the vacuum of the space. And as we know it water is essential component for this planet's ability to sustain life. If there wasn't any water there wouldn't have been any life.

i save earthLife

Thanks to remarkable series of lucky chances, our small, rocky planet has given rise to a spectacular range of environments capable of supporting diverse form of life and even intelligence. Earth's suitability for life seems to be the result of a bizarre series of coincidences or perhaps definitive evidence for the hand of a creator? But on the other hand presence of life on earth is as a result of its history which has resulted in very fragile balance between many natural phenomena's in favor of sustaining life.

Around 425 million years ago, life began to make its way onto our planet, gradually adapting the conditions that it found there to create the familiar environment of today's world. Plants absorbed much of the carbon dioxide as waste, creating conditions for animals to thrive.

Fragile Planet

We need to keep one thing in mind that to form a planet which can support life, it took billion's of years by nature to reach to a stage where it could support life in a very delicately balanced atmosphere. Every process amazingly worked in perfection to make it habitable which can not only support life but make it evolve to a stage that it can nurture and support intelligent life like humans. But what  needs to be understood and stressed is that everything including the atmosphere is extremely delicately balanced and any altercation to it can lead to destruction of not only humans but make this planet uninhabitable to any kind of life like other planets in our solar system.

Earth has a variety of special factors that allow for complex life to flourish on its surface. To describe all of these factors would be beyond the scope of this article. We must realize that how amazing it is and how lucky we are that all these conditions made it possible that we exist today. Most of conditions which made this earth support life relied heavily on a large amount of chance events. With the mind-boggling number of planets in the universe, it is almost ludicrous to think that life exists only on Earth. But what if we are the only ones? What if these factors are so rare, that we are that one-in-a-trillion chance? Its any ones guess. So lets not do something which leads to destruction of the very delicate balance which supports life on Earth.

How Earth might have Formed

After the Big Bang, there was matter and anti-matter. The two could have annihilated each other and canceled out, yet we are here. So there must have been slightly more matter than anti-matter, and this leftover matter is what our universe is made up of today.  Learn more about origin of Solar system and Earth Click here

Life on Earth   to learn more Click here

Life on Earth is a lucky little fluke of nature. The rock record shows when plant and animal groups appeared on earth. The earliest creatures did not had any hard skeleton so its extremely hard to know exactly when did microscopic life appeared on earth. The first multicelled oxygen breathing creature probably appeared about 1 billion years ago after oxygen on earth was well established. By about 600 million years ago marine animals with shells had become widespread. Roughly 500 million years back first animals with backbone appeared this was fish. Soon after that land plants started developing. Insects appeared about 300 millions years back and dinosaurs appeared about 200 million years back. First mammals also appeared during same time around 200 millions years ago. Birds appeared about 150 million years back. About 100 million years ago both animals and birds were well established on earth.

On a time scale of billions of years, human beings has just arrived. The most primitive human type is not more than 4 million years old.  Homo sapiens developed only half a million years back. Nevertheless, we humans have had an enormous impact on the earth, at least its surface, an impact far out of proportion to the length of time we have occupied it.

But what needs to be understood here is that how difficult it is to form a planet like earth which can support life at first place. And then how difficult it is to make those conditions available which can support basic life and also  to evolve it to an extent for millions of years to reach to a point which can create and sustain intelligent life like humans. Nature took billions of years to create this  miracle race by providing necessary conditions and evolve it  continuously to create intelligent race like humans. But that very nature's miracle is threatening its very creator 'The Nature" by its indiscriminate, senseless plundering and continuous altering of its fragile atmosphere by pumping millions of tons of unwanted gases with no care or guilt for its actions.  But little it knows that those vary alterations to natural systems will eventually lead to its own extinction.      

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 MAJOR  CONCERNS

  Learn More
   
  Origin Of Earth
Learn about how Solar System and Earth were formed  and how humans might impact its future.

Dr. Abhinandan Bhardwaj PhD

   
  Earth's History
Learn About Earth's History , How Earth's history shaped its present  and how humans might impact its future.

Dr. Abhinandan Bhardwaj PhD

   
  Earth's Interior
Learn about what earth is made of and What is inside the Earth.

Dr. Abhinandan Bhardwaj PhD

   
  Plate Tectonics
Learn About what is plate tectonics , how it influences Earthquakes.

Dr. Abhinandan Bhardwaj PhD

   
  All about our Universe
Learn about how universe and its galaxies were formed.

Dave Bhardwaj

 

  Earth & Its Atmosphere
Learn about how Earth  and its atmospher.

Dave Bhardwaj

 

   
   
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