The universe is the term that defines the totality of space and time which includes galaxies, dark matters, and dark energy. The universe is about everything that we can even imagine physically. A study related to the universe is called cosmology which is defined by two words Cosmos and Logos.
- Cosmos– means the universe
- Logos– means science.
In this article:-
- About the Universe (with facts)
- Origin of the Universe (with facts)
- Past/History of the Universe (with facts)
About the Universe
In other words, we can say that the universe is the physical beyondness of everything. By the estimation, it is originated almost 13.7 billion(13,000,000,000) years ago. The diameter of the universe is almost 93 billion light-years. It means in 13.7 billion years it expands 93 billion light-years, which clearly says that expansion of the universe is faster than the speed of light in vacuum.
It’s really amazing to know in terms of speed if anything can beat the speed of light is accelerating speed of the universe. This acceleration is happening due to dark energy present in the space. There is almost 70% dark energy, 25% dark matter(both are invisible), and only 5% physical matter present.
Sometime or later in our life, we all think or get the curiosity to know about beyondness of the cosmos and its elements, how it is originated, what was before it, and what will be happening in the future. Let’s get some interesting stuff about it.
Origin of the universe
Much experimental observation describes the origin and evolution of the universe is because of the big bang theory. This is considered as a scientific theory that formulated and proposed by Belgium astronomer and cosmologist Abbe Georges Lemaitre.
In the beginning, there was not anything like stars, galaxies, atoms, and gases. It all started with very small, hot, and super dense forces. At first, these forces started expanding in an accelerating way. Then after a long time in the process of expanding it makes atoms, gases, stars, galaxies, and everything which may be considered physically present. The universe is still expanding in an accelerating way. So the estimated diameter it contains till now is almost 93 billion light-years.
This Includes almost 100 billion galaxies and each galaxy has almost 100 billion stars. So the total number of stars is 1022, which represents a huge number to make anyone amaze.
Past of the Universe: History
To know properly about the cosmos we must know about the past of it. There are many ideas for the origin of the universe presented in many different ways. These are the mythological concept, philosophical concepts, and astronomical concepts.
Mythological concepts also called religious cosmology. In this model, a lot of stories are created by our ancestors for each and every culture.
(*Lol Start- Here I’m not going to entertain you by telling stories, please do not expect it from me. Why hooman created so many cultures? Understanding this topic is more beyond the understanding of the Universe, I think so… *Lol End)
Philosophical concepts are the midst of mythological and astronomical concepts. It contains some stories and some experiments done by many philosophers all over the world. This includes the time range between 500 BC to 1500 AD and gives the idea to human beings to start thinking of the universe and its mysterious facts. In this era following models are given by some famous astrologer and philosopher:
The geocentric theory given by Greek astronomer Ptolemy was originated in almost 140 AD which simply gave the idea that our earth is at the center of the universe.
In almost 1543 AD a theory of Heliocentric which described the Sun is at the center of the universe. This theory is given by Nicolaus Copernicus who was the father of the church and astronomer. A story tells that Copernicus did not tell anyone about this theory because of religious ill-treatment. In the last days of his life, he published this principle in books, but the church found this book and banned it. Later an Italian philosopher and astronomer Giordano Bruno found this book. Bruno spread this book all over in Rome, because of this act Bruno was sent to jail and burnt alive.
The most modern era of the universe starts with the general theory of relativity which is given by Albert Einstein in 1915 AD and the origin of cosmos is predicted as big bang theory. In this theory, he has considered the modern physic with the terms of gravity, space, and time or spacetime and explains the accelerating expansion of our cosmos.
Future of the Universe: End
Did you ever think about how it is all going to end in the future???
Many physicists have estimated that our universe is going to end in between 3 billion years to 20 billion years from now on. Here are some proposed theories are given by astronomer and physicists which describe the ending of it.
1. The big rip
This theory explains by considering the big bang theory and according to this every atom of the universe will rip apart. As the expansion of the cosmos is continues with accelerating speed so at the end everything will tear apart including galaxies followed by stars and every atom will burst eventually.
2. The big freeze
This explains that everything present in the universe will finally get absolute zero temperature. Since every galaxy expanding with very high speed and there will not be available gas for developing new stars it concludes that no development of heat from stars so how temperature will decrease to absolute zero and everything will end at this temperature.
3. The big crunch
According to this theory, there is a possibility that expansion of it will stop after a definite limit. Then it will start shrinking and finally make a very hot, dense, and forceful atom. This hypothesis is symmetrical to the start of the universe by the big bang. So atom will again start a big bang and again a universe will be developed.
These 3 theories are the assumption made by physicists considering some other physic quantities and their principles. As we know that no one has ever seen the future. The most important hypothesis is given for the Big Rip theory.
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