Archive for the ‘cosmology’ category

Jun 4, 2023

Everything Will Evaporate

Posted by in categories: cosmology, particle physics, quantum physics

Even space and time if it’s quantum.

What will be the ultimate fate of our universe? There are a number of theories and possibilities, but at present the most likely scenario seems to be that the universe will continue to expand, most mass will eventually find its way into a black hole, and those black holes will slowly evaporate into Hawking Radiation, resulting in what is called the “heat death” of the universe. Don’t worry, this will likely take 1.7×10106 years, so we got some time.

But what about objects, like stellar remnants, that are not black holes? Will the ultimate fate of the universe still contain some neutron stars and cold white dwarfs that managed to never get sucked up by a black hole? To answer this question we have to back up a bit and talk about Hawking Radiation.

Continue reading “Everything Will Evaporate” »

Jun 4, 2023

Scientists ‘stunned’

Posted by in categories: cosmology, physics

An international team of astrophysicists has discovered hundreds of mysterious structures in the centre of the Milky Way.

The one-dimensional cosmic threads are made up of hundreds of horizontal or radial filaments, slender, elongated bodies of luminous gas that potentially originated a few million years ago — and seem to be pointing the direction of the black hole.

“I was actually stunned when I saw these. We had to do a lot of work to establish that we weren’t fooling ourselves,” added Yusef-Zadeh, who’s also a member of the Center for Interdisciplinary Exploration and Research in Astrophysics.

Jun 3, 2023

Joscha Bach: Time, Simulation Hypothesis, & Existence

Posted by in categories: cosmology, economics, education, government, information science, mathematics, quantum physics, robotics/AI

Joscha Bach is a cognitive scientist focusing on cognitive architectures, consciousness, models of mental representation, emotion, motivation and sociality.

Discord Invite:
Subreddit r/TheoriesOfEverything:

Continue reading “Joscha Bach: Time, Simulation Hypothesis, & Existence” »

Jun 3, 2023

Listen to the Astonishing ‘Chirp’ of Two Black Holes Merging

Posted by in category: cosmology

Some of the most violent cosmic collisions occur silently in the vacuum of space, but with the right instrumental ears, we can still hear it happen. Here’s how.

Jun 3, 2023

New Discovery Challenges Fundamental Beliefs of Astronomy: Giant Arc of Galaxies Spanning 3.3 Billion Light-Years Discovered

Posted by in categories: cosmology, mapping

A recently discovered formation of galaxies spanning 3.3 billion light-years is one of the largest known structures in the universe, contradicting some of the most fundamental beliefs of astronomers about the cosmos. The Giant Arc is composed of galaxies, galaxy clusters, and a significant amount of gas and dust. It is located 9.2 billion light-years away and covers approximately one-fifteenth of the visible universe.

The discovery was “fortuitous,” according to Alexia Lopez, a doctoral candidate in cosmology at the University of Central Lancashire (UCLan) in the United Kingdom. Lopez was creating maps of the night sky using light from around 120,000 quasars, which are the bright centres of galaxies where supermassive black holes consume matter and generate energy.

By measuring magnesium’s imprints, Lopez could calculate the distance to the intervening gas and dust, as well as the composition of the substance. The quasars were used as “spotlights in a dark room,” illuminating the intervening matter, according to Lopez. A structure began to emerge in the middle of the cosmic maps, a massive arc that was an indication of the Giant Arc.

Jun 3, 2023

I don’t believe in free will. This is why

Posted by in categories: cosmology, information science, neuroscience, physics

If I were a brilliant physicist, I would have written this.

Learn more about differential equations (and many other topics in maths and science) on Brilliant using the link You can get started for free, and the first 200 will get 20% off the annual premium subscription.

Continue reading “I don’t believe in free will. This is why” »

Jun 3, 2023

Another Way for Black Holes to Evaporate

Posted by in categories: cosmology, particle physics, quantum physics

The quantum fluctuations that pervade empty space spontaneously give birth to pairs of particles and antiparticles. Ordinarily, these pairs annihilate so promptly that their existence is virtual. But a powerful field can pull a pair’s members apart for long enough that their existence becomes real. In 1951 Julian Schwinger calculated how strong an electric field needs to be to beget electron–positron pairs. Now Michael Wondrak and his colleagues of Radboud University in the Netherlands have proposed that particle pairs can be brought into existence by the immense gravitational tidal forces around a black hole [1].

Wondrak and his colleagues considered all the paths a pair of virtual particles could take during their brief existence. If the vacuum is stable, all pairs that are created are also destroyed. But a strong field destabilizes the vacuum, makes some paths more likely than others, and leads to a deficit of pairs that recombine. The deficit is balanced by a net outflow of real particles, which, in the case of a black hole’s gravitational field, leads to the black hole’s eventual evaporation.

The theorists’ approach is sufficiently general that it could reproduce not only Schwinger’s effect but also Stephen Hawking’s 1974 proposal that if a particle–antiparticle pair springs into virtual existence near a black hole’s event horizon, one member could fall in while the other escapes. What’s more, the researchers found that Hawking’s effect is a special case of a more general phenomenon. Pulling virtual particles into existence depends only on the stretching of spacetime wrought by a curved gravitational field and does not require an event horizon as Hawking originally suggested. One intriguing implication is that a neutron star, whose Schwarzschild radius lies beneath the stellar surface, can also beget particle pairs and decay.

Jun 3, 2023

Supermassive Black Holes Can Blow Winds Up to a Third of The Speed of Light

Posted by in categories: cosmology, evolution

They are known as ultra-fast outflows (UFOs), powerful space winds emitted by the supermassive black holes (SMBHs) at the center of active galactic nuclei (AGNs) – aka. “quasars.” These winds (with a fun name!) move close to the speed of light (relativistic speeds) and regulate the behavior of SMBHs during their active phase.

These gas emissions are believed to fuel the process of star formation in galaxies but are not yet well understood. Astronomers are interested in learning more about them to improve our understanding of what governs galactic evolution.

This is the purpose of the SUper massive Black hole Winds in the x-rAYS (SUBWAYS) project, an international research effort dedicated to studying quasars using the ESA’s XMM-Newton space telescope.

Jun 2, 2023

NASA detects large thermonuclear explosion in space caused by pulsar

Posted by in category: cosmology

NASA recently made an extraordinary discovery of a large thermonuclear explosion in space, caused by a pulsar, which is the remains of a star that did not explode to form a black hole. The National Aeronautics and Space Administration was able to detect the explosion thanks to the strong beam of X-rays sent out by the burst, which was picked up by the agency’s orbiting observatory NICER.

This discovery serves as a potent reminder of the dangers that lurk in space. According to a study published in The Astrophysical Journal Letters in August, the burst released as much energy as the sun does in ten days in just twenty seconds.

The leader of the study and astrophysicist, Peter Bult, said in a statement from NASA, “This burst was great.” Bult also added that the study revealed a two-step change in brightness that they believe was caused by the ejection of separate layers from the pulsar’s surface. These features provide significant information to understand how these events work.

Jun 1, 2023

Another Major Dark Matter Mystery Challenges Scientists

Posted by in category: cosmology

I wrote a foreword for this awesome Sci-Fi book here:
Get a Wonderful Person shirt:
Alternatively, PayPal donations can be sent here:

Hello and welcome! My name is Anton and in this video, we will talk about a strange discovery of excess of dark matter and other related mysteries.
Illustris Project:

Continue reading “Another Major Dark Matter Mystery Challenges Scientists” »

Page 1 of 29612345678Last