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Our Fascinating & Wonderful Universe

By Dave Bhardwaj

 

 

Introduction
The universe is a dangerous and wonderful place at the same time. We donít know a lot about the universe. The question about how big is the Universe  have puzzled scientists forever and they think it may be end less or could have boundaries . It may be curved around itself like a big sphere. What we do know is that, the universe is getting bigger every second. Every second galaxies are slowly moving away from each other. In our great galaxy known as the Milky Way, there are billions of stars. Some stars have planets orbiting them. Our Sun is just one of those stars. Our Sun along with all the other planets travel around the Milky Way, at a speed of 250km a second! Our planet orbits the Sun at a speed of 107,300km an hour.
This brief description talks all about the universe, galaxies, stars and the planet Earth.

 

Universe

 

The Universe
The universe is a huge place. Every day new stars form in the vastness of our universe. We havenít traveled too far. But we have sent probes out in space. Voyager 2 went as far as Neptune. Voyager 1 has a gold plaque, showing humans on it and our solar system.
Stephen Hawking is one of the greatest scientistís in the world. He couldnít speak or hear very well. because of a disease. He suggested that black holes really could exist. He also suggested that our universe is not alone. There might be others making a Ēsuper-universeď.
 
 

Galaxy

Galaxies
                  Galaxies contain billions of stars. There are four main types of stars. Spiral, irregular, elliptical and barred spiral. Our galaxy is known as the Milky Way. Scientistís suggest that in the center of our galaxy, there is a huge black hole. But it would take millions of light years for us to reach the center.
 
Stars
There are trillions of stars in the universe. Stars form in the  clouds called nebulae. The clouds are pulled together by their gravity. If the temperature rises to 18 million F nuclear fusion starts. Gradually, the star turns bigger.

 

Our Solar System ( Look at the Earth..  How small it is.)

Solar System
Our Sun is a bit smaller than an average star. The Sun is made up of 75% hydrogen gases and 25% helium gases. The Sunís temperature is 27 million F the Sunís surface is known as the photosphere. The Sunís atmosphere is made of two layers. The corona and the chromospheres.
 
 

Our Beautiful Home Planet Earth

 

Earth
   Our wonderful planet, Earth is the fifth largest planet in the solar system. The Earthís atmosphere is made up of the troposphere, stratosphere, mesosphere, thermosphere and exosphere.
There is a thin but vital layer of the ozone in the stratosphere. It shields us from the sunís dangerous rays and ultra violet rays. But now we have polluted the Earth to such an extent that has lead to big holes in the  ozone layer which protects us from UV rays. If UV rays come straight to earth it will start killing both plants and animals on Earth. Also because of carbon dioxide pollution earth is experiencing greenhouse effect and that's why its average temperature is slowly rising. Global warming can lead to humans extinction and that is why we must stop the pollution! 

 

About The Author:

This article was written by Dave Bhardwaj a 12 years old (Grade 7) student. For more articles from Dave click here

 
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