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
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Email: snigdhadubey2020@gmail.com