Source : INDIA TODAY NEWS
Deep in the ink-black abyss of the infant universe, a colossal galactic fortress was quietly assembling itself in the dark. Now, a 29-year-old Indian astrophysicist has peeled back 12.6 billion years of cosmic history to uncover this ancient metropolis of galaxies.
Named the Loktak Protocluster, this staggering cosmic megacity emerged a mere 1.2 billion years after the dawn of time itself.
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The universe is estimated to be around 13.8 billion years old, while Earth formed much later, approximately 4.5 billion years ago.
The galactic megacity’s discovery shatters old cosmic timelines, proving that the brutal, crowded environments of early space were already aggressively twisting and shaping the growth of the very first galaxies.
In other words, the finding establishes that crowded space environments were actively reshaping galaxies much earlier than scientists previously thought possible.
WHO IS THE INDIAN SCIENTIST BEHIND THE GALAXY’S DISCOVERY?
Dr Ronaldo Laishram, a brilliant postdoctoral researcher from Manipur, currently stationed at the National Astronomical Observatory of Japan, spearheaded this international breakthrough.
As detailed in a study published in The Astrophysical Journal Letters, the cosmic structure honours Manipur’s legendary Loktak Lake.
Just as patches of floating biomass islands stay tightly linked across the lake, four separate gargantuan galaxy concentrations are bound together here to form a single cosmic web.
This protocluster is an empire under construction, destined to morph into a monolithic galaxy cluster over billions of years.
To understand this cosmic evolution, it helps to break down the stages.
A protocluster is an early cosmic city under construction, made of a dense group of infant galaxies that are slowly pulling together under gravity to form a single massive galaxy cluster over billions of years.
To picture it simply, while most normal galaxies grow slowly over billions of years by eating smaller neighbours, a monolithic galaxy is a cosmic one-hit wonder.
It forms its entire massive structure in a single, sudden, and spectacular burst of star formation, emerging fully formed like a grand palace built overnight from a cloud of cosmic mist.
Unlike traditional galaxies that act like cosmic construction sites, slowly building themselves over billions of years by colliding with and swallowing smaller star systems, a monolithic galaxy skips this piecemeal assembly. It does not eat existing stars; it brews them all at once from scratch.
In the pristine environment of the early universe, an immense, isolated reservoir of hydrogen and helium gas collapses rapidly under its own immense gravity.
This sudden, violent shrinkage triggers a simultaneous, frantic wave of star birth throughout the entire cloud.
Instead of a slow growth story, the universe experiences a sudden, synchronised flash of creation, turning an invisible cloud of cosmic gas into a mature, brilliant monolithic galaxy, which is a unified stellar empire born almost instantly on a cosmic timescale.
HOW DO CROWDED COSMIC NEIGHBOURHOODS FORCE GALAXIES TO GROW?
By fusing the raw optical power of Japan’s Subaru Telescope with Nasa’s James Webb Space Telescope, the team unmasked a glaring structural anomaly.
When viewed in ultraviolet light, which is high-energy light that highlights frantic newborn stars and intense star-forming regions, these cluster galaxies looked perfectly ordinary.
But when the James Webb Space Telescope exposed them in rest-frame optical light, the cluster variants were suddenly 40 per cent larger than isolated systems.
Rest-frame optical light is the visible light originally emitted by ancient stars billions of years ago, which stretches into infrared wavelengths as it travels through expanding space, before being captured by telescopes.
This stretching effect is known as cosmic redshift, a phenomenon where light waves are literally elongated because the very fabric of space-time is expanding.
Because the universe expands as light travels across billions of light-years, highly energetic, short wavelengths like ultraviolet and visible light get pulled out into long, invisible infrared wavelengths by the time they reach our modern detectors.
This revealing light uncovers a crowded neighborhood where galaxies are positioned at a busy intersection of the cosmic web.
By efficiently drawing in vast clouds of cold gas from their surroundings, these galaxies fuel a rapid and fiery birth of new stars, allowing them to shine brightly in oversized gowns of starlight.
– Ends
SOURCE :- TIMES OF INDIA
