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Category: cosmology – Page 44

A Team Of Physicists Says There May Be Another Universe Running Backward In Time Prior To The Big Bang

What lies beyond the beginning of time? Physicists are exploring groundbreaking ideas that could reveal a hidden universe behind the Big Bang.

This mind-bending theory challenges everything we know about existence and the mysteries of our cosmic origins.

Imagine rewinding the story of our universe —back through billions of years of expansion, past the formation of galaxies, stars, and planets, to the very beginning. What if, instead of a single moment of creation, there was a cosmic reflection—a mirror image of everything we know, moving backward in time?

This is the tantalizing idea proposed by a group of physicists, suggesting that before the Big Bang, another universe may have existed, running in reverse. In this mirrored cosmos, time flows backward, and the very nature of existence challenges the boundaries of our understanding. Could this alternate reality hold the answers to some of the greatest mysteries in science, like the elusive nature of dark matter or the imbalance between matter and antimatter?

As groundbreaking as it sounds, this theory doesn’t just shake up the foundations of modern physics—it opens the door to deeper philosophical questions. What if the universe isn’t a singular event but part of a grander, cyclical dance? What if time, as we perceive it, is merely one piece of a much larger puzzle?

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LIGO Fails to Find Continuous Gravitational Waves From Pulsars

In February 2016, scientists working for the Laser Interferometer Gravitational-Wave Observatory (LIGO) made history by announcing the first-ever detection of gravitational waves (GW). These waves, predicted by Einstein’s Theory of General Relativity, are created when massive objects collide (neutron stars or black holes), causing ripples in spacetime that can be detected millions or billions of light years away. Since their discovery, astrophysicists have been finding applications for GW astronomy, which include probing the interiors of neutron stars.

For instance, scientists believe that probing the continuous gravitational wave (CW) emissions from neutron stars will reveal data on their internal structure and equation of state and can provide tests of General Relativity. In a recent study, members of the LIGO-Virgo-KAGRA (LVK) Collaboration conducted a search for CWs from 45 known pulsars. While their results showed no signs of CWs emanating from their sample of pulsars, their work does establish upper and lower limits on the signal amplitude, potentially aiding future searches.

The LVK Collaboration is an international consortium of scientists from hundreds of universities and institutes worldwide. This collaboration combines data from the Laser Interferometer Gravitational-Wave Observatory’s (LIGO) twin observatories, the Virgo Observatory, and the Kamioka Gravitational Wave Detector (KAGRA). The preprint of the paper, “Search for continuous gravitational waves from known pulsars in the first part of the fourth LIGO-Virgo-KAGRA observing run,” recently appeared online.

Black Hole Plasma Jets Seen Traveling at Record Speeds Leave Astronomers Stunned

A supermassive black hole in a distant galaxy is rewriting the rules of astrophysics, with unprecedented activity that has left astronomers around the world both fascinated and perplexed. Plasma jets traveling at record-breaking speeds and rapid X-ray fluctuations near the event horizon are just some of the strange phenomena observed in real time. What secrets is this cosmic behemoth revealing, and how might it reshape our understanding of black holes?

First-ever Binary Star Found Near our Galaxy’s Supermassive Black Hole

An international team of researchers has detected a binary star orbiting close to Sagittarius A*, the supermassive black hole at the center of our galaxy. It is the first time a stellar pair has been found in the vicinity of a supermassive black hole.

The discovery, based on data collected by the European Southern Observatory’s Very Large Telescope (ESO’s VLT), helps us understand how stars survive in environments with extreme gravity, and could pave the way for the detection of planets close to Sagittarius A*.

“Black holes are not as destructive as we thought,” says Florian Peißker, a researcher at the University of Cologne, Germany, and lead author of the study published in Nature Communications.

Cosmic Titans on a Collision Course: Two Monster Black Holes Poised to Shake Space-Time Itself

Astronomers have identified two supermassive black holes, collectively known as PKS 2131-021, that are on the brink of a catastrophic collision. Located about 9 billion light-years from Earth, these black holes have been spiraling toward each other for 100 million years and now orbit one another every two years. The discovery, published in The Astrophysical Journal Letters, reveals a fascinating binary system that could help scientists understand how black holes form and merge.

PKS 2131-021 is a type of black hole known as a blazar, characterized by jets of supercharged plasma directed at Earth. These jets, which originate from the hot gas swirling around the black hole, travel at nearly the speed of light. When researchers observed the brightness of about 1,800 blazars across the universe, PKS 2131-021 stood out due to its regular fluctuations, akin to the ticking of a clock. This periodic dimming and brightening is believed to result from the gravitational influence of a second black hole in orbit.

To confirm this, scientists analyzed 45 years of data from five observatories. The findings matched predictions, confirming that the brightness variations were caused by a binary black hole system.

Galactic Gravity’s Secret Role in Black Hole Collisions

Galactic gravity can dramatically impact wide binary stars, pushing them towards unexpected mergers or collisions.

The detection of gravitational waves.

Gravitational waves are distortions or ripples in the fabric of space and time. They were first detected in 2015 by the Advanced LIGO detectors and are produced by catastrophic events such as colliding black holes, supernovae, or merging neutron stars.

A black hole’s winds disrupt galaxy’s star formation

A New Phenomenon in Markarian 817

Astronomers have observed a supermassive black hole in the galaxy Markarian 817 (Mrk 817), located 430 million light-years away in the constellation Draco, unleashing ultra-fast winds that are disrupting its host galaxy. Detected using ESA’s XMM-Newton space telescope, this discovery marks the first instance of such winds emerging from a moderately feeding black hole, defying previous expectations.

AI agents may soon surpass people as primary application users

That’s the word from a new set of predictions for the decade ahead issued by Accenture, which highlights how our future is being shaped by AI-powered autonomy. By 2030, agents — not people — will be the “primary users of most enterprises’ internal digital systems,” the study’s co-authors state. By 2032, “interacting with agents surpasses apps in average consumer time spent on smart devices.”

Also: In a machine-led economy, relational intelligence is key to success

This heralds a moment of transition, what the report’s primary author, Accenture CTO Karthik Narain, calls the Binary Big Bang. “When foundation models cracked the natural language barrier,” writes Narain, “they kickstarted a shift in our technology systems: how we design them, use them, and how they operate.”

Discovery poised to help detect dark matter and pave way to unravel the universe’s secrets

Researchers led by Nanyang Technological University, Singapore (NTU Singapore) have developed a breakthrough technique that could lay the foundations for detecting the universe’s “dark matter” and bring scientists closer than before to uncovering the secrets of the cosmos.

The things we can see on Earth and in space— like rocks and stars—make up only a small portion of the universe, as scientists believe that 85% of matter in the cosmos comprises invisible . This mysterious substance is said to be the invisible glue holding galaxies together. Finding it could help us understand cosmic phenomena that cannot be explained solely by the matter we see.

But proving the existence of dark matter is a herculean task. As its name suggests, dark matter is “dark,” meaning it does not normally emit or reflect light, carries no electric charge and interacts extremely weakly with normal matter, making it undetectable with conventional scientific instruments.