Universe in simple words is a region which is composed of celestial objects like galaxies, stars, planets, asteroids, meteors, comets, black holes, white holes (sounds mysterious right? 🤔)...sorry if I have missed out anything...😅
''Two possibilities exist: either we are alone in the Universe or we are not. Both are equally terrifying''
Arthur C. Clarke
The universe is so beautiful, extraordinary and mysterious that it is and remains a system which humans won't be able to understand completely, even if they could it, there could be something, something out there which still remains unnoticed and researched...
Human Beings have shown a fascinating interest in understanding the universe, it all started with the launch of Sputnik 1 by the then Soviet Union which in turn became the first artificial satellite in the history of the world.
The launch of the Apollo series of satellites paved a new way for human endeavor in the field of space research. Soon space research and astronomy became the cornerstone of development and many countries poured their existing resources for space research, countries started setting up their own space agencies, for example; Russia has the 'Roscosmos', U.S. has NASA, India has ISRO, Japan has JAXA.
''Mathematics is the language with which God has written the Universe''
- Galileo Galilei
The evolution of the Universe has been conceived in different ways by people around the world. The most widely accepted notion is the 'Big Bang Theory'. The Big Bang Theory states that matter occupied a very compact space having infinite density and therefore the heat associated with this space is very high, such a condition is called a 'singularity'. This system began to expand and expand and finally resulted in what is called the 'Big Bang'. After this sudden expansion the universe cooled down resulting in the formation of sub-atomic particles like electrons and protons which later formed atoms.
The above image clearly illustrates the development of science with the evolution of universe. Mathematics and Physics remains the most fundamental sciences of nature. Physics and mathematics deals with truth and therefore it has its own difficulty and challenges because there is no easy way understand truth. Chemistry and Biology evolved later on, and are among the sciences which are understood deeply by human beings.
Have you heard about black holes?
Most of you might be familiar about this term from Professor Stephen Hawking's works. A black hole is region in the universe where there is a very large concentration of mass which in turn results in the formation of an intense, powerful gravitational field. The field is so strong that no one can escape from its influence, even light!
Another interesting phenomena associated with black hole is the influence it has on time. If you are alive, just look at your watch, it ticks slowly and slowly as you go deep into it. When you are very much inside it, one minute in your watch corresponds to more than 700 years, look at the numbers. How amazing it is, all these are theoretical concepts because when you reach the vicinity of a black hole you get sucked into it and you will never be able to celebrate your birthday back on Earth with your family...
Imagine if our schools are in the vicinity of a black hole then...time ticks slowly and a three hour exam on earth would be equal to 66,22,56,00,000 earth minutes inside a black hole!!!
GALAXY
Galaxies are large clusters of stars. Our Solar System is situated in Milky Way Galaxy, likewise we have the Andromeda Galaxy, Whirlpool Galaxy etc.
If we take the Milky Way Galaxy, it has millions and millions of starts and our Sun is just one among them. Sirius A, Pistol Star, Dog Star, UY Scuti are some stars which are larger than our Sun. The Sun is the largest object in our Solar System, but there are many other Solar Systems in the Milky Way and we are just one among them, moreover our Sun is more than 100 times the size of Earth, and our Earth is about 4 million times larger than a normal human being...
We boast that we are the most powerful, look how tiny we are in the Universe...If we compare the our Universe and a normal human being, then I can say that the size of the universe is one trillion trillion trillion....n....times greater than a human being. Moreover if you ask a theoretical physicist then he can explain the existence of parallel universe that exist just the way ours exist. Black holes are considered as the 'key' to the next Universe.
The Universe is constantly expanding and according to physics it will eventually attain a maximum size followed by the phenomenon of 'Big Crunch', in which the existing Universe is destroyed leading to the formation of a new one...
''Look again at that dot. That's here, That's home. That's us''
-Carl Sagan, in his book Pale Blue Dot: A Vision of the Human Future in Space, after seeing the above image
Image Credits:
1. Wikimedia Commons: Sputnik 1, Black Hole, Milky Way Galaxy, Andromeda Galaxy and Whirlpool Galaxy
2. Pale Blue Dot: NASA, from solarsystem.nasa.gov
3. Evolution of various Sciences: ktwop.com
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