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Category: cosmology – Page 3

Confirmed! We Are Surrounded by Invisible Black Holes

The solar system may look isolated, but the Milky Way could be filled with rogue black holes drifting silently between the stars. These invisible black holes do not shine or reflect light, making them almost impossible to detect unless their gravity bends the light of a distant star. To learn more about rogue black holes near our solar system, you can watch this video.

Paperlink: https://arxiv.org/pdf/2601.

Chapters:
00:00 Introduction.
00:52 The Galaxy Is Full of Invisible Black Holes.
02:55 The Nearest Black Hole May Be Closer Than We Think.
06:16 How Scientists Search for Something That Emits No Light.
09:27 Outro.
09:44 Enjoy.

MUSIC TITLE: Starlight Harmonies.

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We FINALLY Know What Happened Before the Big Bang

Have you ever wondered what existed before the Big Bang? For decades, scientists believed that this question had no answer. But new ideas in cosmology and theoretical physics are challenging that assumption.

In this video, we explore some of the most fascinating scientific theories about what may have happened before the birth of our universe. From quantum gravity and cosmic bounces to eternal inflation, multiverse models, and the possibility that our universe emerged from a previous cosmic cycle, these concepts push the boundaries of modern science.

Could time itself have existed before the Big Bang? Was our universe born from the collapse of another? Or is the Big Bang not the true beginning after all?

Join us as we dive into the latest research, thought-provoking hypotheses, and the biggest unanswered questions about the origin of reality.

If you enjoy videos about space, black holes, the universe, and the greatest mysteries of physics, don’t forget to like, subscribe, and turn on notifications for more cosmic explorations.

#BigBang #Universe #Cosmology #Space #Astronomy #Physics #Science #BlackHoles #Multiverse #JWST

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JWST finds the most distant barred galaxy candidate in the early universe

Astronomers using the James Webb Space Telescope have identified what may be the most distant barred spiral galaxy ever discovered, dating to a time less than 1.2 billion years after the Big Bang. The paper outlining its properties was posted to the arXiv preprint server on June 23.

Stellar bars are elongated formations of stars that stretch across a galaxy’s central region, spinning together as a single, unified structure. Through this rotation, they function much like a funnel, channeling gas toward the galactic center. This can ignite bursts of star formation, supply material to the central black hole and contribute to the buildup of a compact core. Such structures are common among galaxies in the local universe, and our own Milky Way is one example of a barred galaxy.

But bars don’t just form anywhere. They take shape in galaxies where stars move in smooth and orderly fashion, with something called a dynamically “cold” disk. Early-universe galaxies were the opposite: turbulent and gas-rich, constantly disrupted by mergers and bursts of star formation, conditions that should keep disks “hot” and unsettled for billions of years.

Evidence Mounts for Hierarchical Black Hole Mergers

Different analyses of gravitational-wave observations are converging on evidence for a distinct population of massive black hole binaries produced through repeated mergers.

Throughout the Universe, pairs of orbiting black holes emit ripples in spacetime that propagate across the cosmos. These gravitational waves carry away orbital energy, causing the black holes to slowly spiral closer together. This process is extremely slow, but, in a minority of cases, it leads to a cataclysmic merger within the age of the Universe. Since the historic detection of gravitational waves in 2015 (see Viewpoint: The First Sounds of Merging Black Holes), the LIGO, Virgo, and KAGRA gravitational-wave detectors have advanced to the point of recording a signal from merging black holes every few days of operation, yielding a cumulative catalog of hundreds [1]. Understanding how, when, and where the Universe produces these extreme astrophysical collisions remains an open question, with implications spanning physical scales from the subatomic to the cosmological.

Now, two teams led, respectively, by Cailin Plunkett at MIT [2] and Sharan Banagiri at Monash University in Australia [3] present evidence that a subset of binary black hole observations can be connected to a particular origin story: that of hierarchical mergers, in which at least one member of the pair is not the remnant of a dead star but instead the product of an earlier black hole merger (Fig. 1). The fact that these and other analyses [4– 10], based on markedly different assumptions, converge on a similar conclusion strengthens the case that hierarchical mergers constitute an important contribution to the binary black hole population.

Detecting neutron sources by borrowing inference tools from cosmology

Neutron sources can be directly identified from measured spectra rather than proxies using inference tools adapted from cosmology, according to a University of Michigan Engineering study published in Physical Review Applied. The method can improve nuclear security by helping intercept materials at ports or borders or guide first responders during emergency response.

Directly detecting and characterizing a neutron source remains a challenge because most nuclear materials emit neutrons with energy patterns, called neutron spectra, that look similar to one another—whether from a benign industrial isotope or fissile material.

“This problem sits at the intersection of fundamental physics, statistics and real-world nuclear security. There is a very practical need to identify unknown neutron-emitting materials, but there is also a deep scientific challenge: How do you extract reliable information from signals that are weak, noisy and highly similar?” said David Breitenmoser, a postdoctoral research fellow of nuclear engineering and radiological sciences at U-M and lead author of the study.

How to Survive the Ultimate Cosmic Doomsday

What happens when the laws of the universe turn against existence itself?
In this cinematic 4K documentary, we journey through a hierarchy of cosmic catastrophes that challenge the survival of any civilization, from the localized death of planets to the absolute collapse of physical laws.

▶A Film by: Scienshell Studio.

In a universe governed by deep time and immense forces, disaster is not a matter of if, but when. From worlds frozen in perpetual schizophrenia by tidal locking to the ultimate recollapse of space-time, civilizations must either evolve to engineer the cosmos or face total eradication.

But as the scale of destruction grows, the line between technology and natural law begins to blur. For those who survive the end of the universe, reality itself becomes a blank canvas.

In this video, you’ll discover:
00:00 Introduction.
02:35 Tidally Locked Worlds and Planetary Accelerators.
05:35 Stellar Storms and Planetary Shield.
08:43 Supernovae and Star Lifting.
11:53 Supermassive Black Holes and The Space Nomads.
14:54 Interstellar Interceptors: The Predator and the Prey.
17:08 The Inflaton Field and The Big Crunch.
21:01 Higgs Field Decay: The Death of Matter and Gravity.
22:31 Beyond Physics: Civillization with godly powers.

▶ About This Video.

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Physicists Simulated a Black Hole in a Lab. Then It Started to ‘Evaporate’

The one thing we all ‘know’ about black holes is that nothing escapes their ineluctable grasp.

That is mostly true – but since the 1970s, physicists have predicted that black holes could slowly lose energy in the form of thermal radiation.

This is Hawking radiation, and while it has been recreated in laboratory analogs, the mechanism whereby it siphons energy from a black hole, known as backreaction, has remained elusive.

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