THE ODYSSEY OF UNIVERSE : Snigdha Dubey

The imposing mosaic of our cosmos, stands as a silent yet powerful force,

orchestrating the mesmerizing dance of celestial bodies. The journey began with

what we know as the Big Bang, a cataclysmic event that took place

approximately 13.8 billion years ago. It is impossible to visualize the scale of the

universe. In the piece of the universe we can see, there are something like

roughly 2 trillion galaxies, of course we haven’t counted it, that’s an estimate

based on surveys of the local universe. 2 trillion- 2,000 billion galaxies, and each

galaxy is let’s say around the size of Milky Way, some are bigger, some are

smaller. The Milky Way has around 400 billion stars in it. It takes light over

hundred thousand years to cross across a galaxy and there’s a two trillion of them

in the piece of the universe we can see. And we’re very sure that, that piece we

can see is a small bit of what may be an infinite universe beyond. As far as you

can see in the night sky, you are able to look into past, as light from the stars

takes years to travel and reach earth. The farthest we can see in time is 13.8

billion years. That’s right, we can see the stars formed just right after the Big

Bang. During Big Bang, in an instant, all the matter and energy in the universe

was paced into a singularity, a point of infinite density and temperature and no

volume. Then in a fraction of second, the universe began to expand rapidly,

creating space and time as we know it today.

As the universe expanded, it cooled and condensed, allowing matter to form and

gravity to take hold. Over millions of years, clouds of gas and dust began to

collapse under their own gravity, forming the first stars and galaxies. As stars

formed, they went through a process of nuclear fusion, converting hydrogen into

helium and other elements. These fusion reactions released massive amounts of

energy. Some stars eventually exploded in supernovae (a powerful and extremely

luminous stellar explosion that occurs when a star reaches the end of its life

cycle), dispersing their elements into space for the formation of future

generations of stars and planets. The molecules that comprise our body are

traceable to the crucibles of centres of stars that manufactured these elements

from lighter versions of themselves, then exploded, scattering this enrichment

across the galaxy into gas clouds that would later collapse under their own

gravity to form next generation star systems. One of the star systems was ours.

These molecules and atoms are in us because in fact the universe is in us, and we

are not only figuratively but also literally stardust.

Physicists, theorists and philosophers deliberated that this grandeur structure was

made up of time and space or so we all thought!

We are now exploring the idea that space and time may not be the building

blocks of the universe as we once believed. Instead, we are considering the

possibility that they are constructed from something more fundamental. This

realization leads us to question the very fabric of reality and opens up new

avenues for exploration and discovery.

The intriguing notion that an object entering a black hole may eventually re-

emerge in some form in the distant future, is akin to the idea that in principle if

all components of a burning book, including the ashes and emitted light, could

theoretically be gathered, we could actually reconstruct it back to its original

form. Our investigations suggest that the same principle could apply to black

holes. When an object enters a black hole, it may journey to what is perceived as

the end point of time - the singularity. Different perspectives offer contrasting

views, with the object either crossing the horizon or being vaporized, yet both

interpretations represent aspects of the same underlying physics.

Now the question arises- that if space and time are not the fundamental properties

of the universe then space and time must be made up of something else. It’s all

inspiring to think that time may be made up of something. As of now we don’t

know much of it but in quantum physics we have defined the building blocks of

time as chronons. There is currently no experimental evidence for the existence

of chronons, and they remain a theoretical concept. As for space, one proposed

idea is that space could be composed of units known as space-time atoms.

Everything is but in theory possible as of now. We are advancing and making

achievements but discovering the universe may take several decades and

understanding the true nature of it may take aeons.

As we unravel the secrets of space and time, we are embarking on a journey of

discovery that challenges our perceptions and opens up new possibilities for

exploration. The idea that space and time may be constructed from more

fundamental components challenges the very essence of our reality, inviting us to

contemplate the nature of the universe in ways we never imagined. In the grand

tapestry of the cosmos, we are but mere stardust, interconnected with the vast

expanse of space and time. As we gaze into the night sky and ponder the

mysteries of the universe, we are reminded of our place in the cosmos and the

boundless potential for knowledge and understanding that lies ahead.

sources-

English Physicist - Professor Brian Cox

American astrophysicist – Neil deGrasse Tyson

Wikipedia

इस की लेखिका स्निग्धादुबे कक्षा ग्यारह की छात्रा है

Name: Snigdha Dubey

Class: 11th

Contact Details

Email: snigdhadubey2020@gmail.com