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Archive for the ‘cosmology’ category: Page 5

Nov 10, 2021

Gravitational Waves Will Soon Lift Veil On Black Holes, Says Portuguese Astrophysicist

Posted by in categories: cosmology, physics

Of the cosmos’ four fundamental forces, gravity is the one that grasps us even before we exit the womb. From our first few minutes of life until we lose the fight to lift our heads from death’s pillow, this weakest of nature’s fundamental forces continues to elude researchers.

In the last few years, however, gravitational wave astronomy has made great strides in detecting gravitational radiation rippling through spacetime at the speed of light.

Einstein first predicted that any accelerating mass should emit gravitational radiation in the form of waves. Gravitational waves were first indirectly detected almost 20 years ago. But it was only recently, in 2,015 that the ground-based LIGO (Laser Interferometer Gravitational-wave Observatory) detected waves from two merging stellar mass black holes over a billion light years distant in the general direction of the Southern Hemisphere’s Magellanic Clouds.

Nov 9, 2021

Look: Largest-ever catalog of gravitational-wave events

Posted by in categories: cosmology, physics

In 2,015 researchers at the Laser Interferometer Gravitational-Wave Observatory (LIGO) captured the first direct evidence of gravitational waves, more than a century after the phenomenon was first proposed.


Gravitational-wave events have only been detectable for a few years, and a new study shows the remarkable diversity of waves caused by black hole mergers.

Nov 9, 2021

SEVEN CONVERGING TECHNOLOGICAL FUNCTIONS WILL PERMANENTLY CHANGE CITIZEN ASTRONOMY

Posted by in categories: augmented reality, computing, cosmology, mobile phones

By Jeremy Batterson 11-09-2021

The equivalent of cheap 100-inch binoculars will soon be possible. This memo is a quick update on seven rapidly converging technologies that augur well for astronomy enthusiasts of the near future. All these technologies already exist in either fully developed or nascent form, and all are being rapidly improved due to the gigantic global cell phone market and the retinal projection market that will soon replace it. Listed here are the multiple technologies, after which they are brought together into a single system.

1) Tracking.
2) Single-photon image sensing.
3) Large effective exit pupils via large sensors.
4) Long exposure non-photographic function.
5) Flat optics (metamaterials)
6) Off-axis function of flat optics.
7) Retinal projection.

Continue reading “SEVEN CONVERGING TECHNOLOGICAL FUNCTIONS WILL PERMANENTLY CHANGE CITIZEN ASTRONOMY” »

Nov 8, 2021

Scientists detect a ‘tsunami’ of gravitational waves

Posted by in categories: cosmology, physics

A team of international scientists, including researchers from The Australian National University (ANU), have unveiled the largest number of gravitational waves ever detected.

The discoveries will help solve some of the most complex mysteries of the Universe, including the building blocks of matter and the workings of space and time.

Continue reading “Scientists detect a ‘tsunami’ of gravitational waves” »

Nov 8, 2021

Loop Quantum Cosmology Theory: Cosmic Tango Between the Very Small and the Very Large

Posted by in categories: cosmology, quantum physics

Theory of loop quantum cosmology describes how tiny primordial features account for anomalies at the largest scales of the universe.

While Einstein’s theory of general relativity can explain a large array of fascinating astrophysical and cosmological phenomena, some aspects of the properties of the universe at the largest-scales remain a mystery. A new study using loop quantum cosmology—a theory that uses quantum mechanics to extend gravitational physics beyond Einstein’s theory of general relativity—accounts for two major mysteries. While the differences in the theories occur at the tiniest of scales—much smaller than even a proton—they have consequences at the largest of accessible scales in the universe. The study, which was published online on July 29 2020, in the journal Physical Review Letters, also provides new predictions about the universe that future satellite missions could test.

While a zoomed-out picture of the universe looks fairly uniform, it does have a large-scale structure, for example because galaxies and dark matter are not uniformly distributed throughout the universe. The origin of this structure has been traced back to the tiny inhomogeneities observed in the Cosmic Microwave Background (CMB)—radiation that was emitted when the universe was 380 thousand years young that we can still see today. But the CMB itself has three puzzling features that are considered anomalies because they are difficult to explain using known physics.

Continue reading “Loop Quantum Cosmology Theory: Cosmic Tango Between the Very Small and the Very Large” »

Nov 7, 2021

3 Jaw-Dropping Reasons You Should be Terrified of Black Holes

Posted by in category: cosmology

Black holes are a hot topic in the news these days.


Black holes – regions in space where gravity is so strong that nothing can escape – are a hot topic in the news these days.

Nov 7, 2021

We now know the big bang theory is (probably) not how the universe began

Posted by in categories: cosmology, physics, singularity

The Big Bang still happened a very long time ago, but it wasn’t the beginning we once supposed it to be.

Where did all this come from? In every direction we care to observe, we find stars, galaxies, clouds of gas and dust, tenuous plasmas, and radiation spanning the gamut of wavelengths: from radio to infrared to visible light to gamma rays. No matter where or how we look at the universe, it’s full of matter and energy absolutely everywhere and at all times. And yet, it’s only natural to assume that it all came from somewhere. If you want to know the answer to the biggest question of all — the question of our cosmic origins — you have to pose the question to the universe itself, and listen to what it tells you.

Today, the universe as we see it is expanding, rarifying (getting less dense), and cooling. Although it’s tempting to simply extrapolate forward in time, when things will be even larger, less dense, and cooler, the laws of physics allow us to extrapolate backward just as easily. Long ago, the universe was smaller, denser, and hotter. How far back can we take this extrapolation? Mathematically, it’s tempting to go as far as possible: all the way back to infinitesimal sizes and infinite densities and temperatures, or what we know as a singularity. This idea, of a singular beginning to space, time, and the universe, was long known as the Big Bang.

Nov 6, 2021

Did Time Start at the Big Bang?

Posted by in categories: cosmology, education, information science, physics, singularity

Thanks to LastPass for sponsoring PBS DS. You can check out LastPass by going to https://lastpass.onelink.me/HzaM/2019Q3JulyPBSspace.

PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateSPACE

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Nov 6, 2021

The Simulation Hypothesis | Is Anything ‘Real’

Posted by in categories: computing, cosmology, Elon Musk, entertainment, mathematics, particle physics, virtual reality

Have you ever seen the popular movie called The Matrix? In it, the main character Neo realizes that he and everyone else he had ever known had been living in a computer-simulated reality. But even after taking the red pill and waking up from his virtual world, how can he be so sure that this new reality is the real one? Could it be that this new reality of his is also a simulation? In fact, how can anyone tell the difference between simulated reality and a non-simulated one? The short answer is, we cannot. Today we are looking at the simulation hypothesis which suggests that we all might be living in a simulation designed by an advanced civilization with computing power far superior to ours.

The simulation hypothesis was popularized by Nick Bostrum, a philosopher at the University of Oxford, in 2003. He proposed that members of an advanced civilization with enormous computing power may run simulations of their ancestors. Perhaps to learn about their culture and history. If this is the case he reasoned, then they may have run many simulations making a vast majority of minds simulated rather than original. So, there is a high chance that you and everyone you know might be just a simulation. Do not buy it? There is more!

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Nov 4, 2021

University of Chicago Biochemist: All Living Cells Are Cognitive

Posted by in categories: cosmology, neuroscience

It’s awe-inspiring to realize that there is a complex intelligence in every living cell. Two questions arise: Is it the intelligence of the cell? That seems inconsistent with how we usually use the word “intelligence.” If we see that a one-celled life form functions with lot of intelligence, perhaps it is more like a book that contains great ideas. Paper doesn’t create ideas; neither, by itself, does protoplasm. Something else is at work.

If the cell itself does not create the intelligence it embodies, what does? Panpsychists argue that all of nature participates in some way in consciousness and humans are the most highly developed example. Theists argue that only a mind outside the universe could create something like human consciousness.

As we learn more and more about the intricate complexities of nature, perhaps debates over the origin of life, intelligence, consciousness, and similar topics will increasingly be between panpsychists and theists rather than materialists and theists. A whole new environment.

Continue reading “University of Chicago Biochemist: All Living Cells Are Cognitive” »

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