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Archive for the ‘cosmology’ category: Page 150

Aug 23, 2020

NASA’s New $10 Billion Telescope to Study Quasars and Their Host Galaxies in Three Dimensions

Posted by in categories: cosmology, materials

Supermassive black holes, which likely reside at the centers of virtually all galaxies, are unimaginably dense, compact regions of space from which nothing — not even light — can escape. As such a black hole, weighing in at millions or billions of times the mass of the Sun, devours material, it is surrounded by a swirling disk of gas. When gas from this disk falls towards the black hole, it releases a tremendous amount of energy. This energy creates a brilliant and powerful galactic core called a quasar, whose light can greatly outshine its host galaxy.

Astronomers widely believe that the energy from quasars is responsible for limiting the growth of massive galaxies. Shortly after the launch of NASA ’s James Webb Space Telescope, scientists plan to study the effect of three carefully selected quasars on their host galaxies in a program called Q3D.

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Aug 22, 2020

Spinning black hole powers jet by magnetic flux

Posted by in category: cosmology

Black holes are at the center of almost all galaxies that have been studied so far. They have an unimaginably large mass and therefore attract matter, gas and even light. But they can also emit matter in the form of plasma jets—a kind of plasma beam that is ejected from the center of the galaxy with tremendous energy. A plasma jet can extend several hundred thousand light years far into space.

When this intense radiation is emitted, the black hole remains hidden because the light rays near it are strongly bent leading to the appearance of a shadow. This was recently reported by researchers of the Event Horizon Telescope (EHT) collaboration for the in the giant ellipse galaxy M87.

In quasar 3C279—also a black hole—the EHT team found another phenomenon: At a distance of more than a thousand times the shadow of the black hole, the core of a suddenly lit up. How the energy for this jet could get there as if through an invisible chimney was not yet known.

Aug 21, 2020

Physicists Say They’ve Found Evidence of Elusive Axion Particle

Posted by in categories: cosmology, particle physics

While axions are not currently a proposed direct explanation for dark matter, they could’ve set the stage for the creation of dark matter in the early stages of our universe.

Scientists are undeniably excited by this third possibility, though they’re also urging restraint due to the other potential explanations.

“I’m trying to be calm here, but it’s hard not to be hyperbolic,” Neal Weiner, a particle theorist at New York University, who was not involved in the research, told The New York Times. “If this is real, calling it a game changer would be an understatement.”

Aug 20, 2020

The 15 Weirdest Galaxies in Our Universe

Posted by in category: cosmology

There are galaxies shaped like jellyfish, galaxies that consume other galaxies, and galaxies that seem to lack the dark matter that pervades the rest of the universe. Here are the strangest galaxies in the universe.

Aug 20, 2020

“The Inconstant Universe” –Weird Findings Point to a New Physics

Posted by in categories: cosmology, quantum physics

“Our standard model of cosmology is based on an isotropic universe, one that is the same, statistically, in all directions,” says astrophysicist John Webb at the University of New South Wales about the universal constant which appears inconstant at the outer fringes of the cosmos, it occurs in only one direction…” That standard model itself is built upon Einstein’s theory of gravity, which itself explicitly assumes constancy of the laws of Nature. If such fundamental principles turn out to be only good approximations, the doors are open to some very exciting, new ideas in physics.”

Those looking forward to a day when science’s Grand Unifying Theory of Everything could be worn on a t-shirt may have to wait a little longer as astrophysicists continue to find hints that one of the cosmological constants is not so constant after all.

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Aug 20, 2020

Kepler’s supernova remnant: Debris from stellar explosion not slowed after 400 years

Posted by in categories: cosmology, materials

Astronomers have used NASA’s Chandra X-ray Observatory to record material blasting away from the site of an exploded star at speeds faster than 20 million miles per hour. This is about 25,000 times faster than the speed of sound on Earth.

Kepler’s supernova remnant is the debris from a detonated star that is located about 20,000 light years away from Earth in our Milky Way galaxy. In 1604 early astronomers, including Johannes Kepler who became the object’s namesake, saw the supernova explosion that destroyed the star.

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Aug 20, 2020

Supernova could explain extinctions at the end of the Devonian period

Posted by in categories: cosmology, existential risks

Aug. 18 (UPI) — New research suggests harmful cosmic rays from a nearby supernova might have caused the extinction events that form the boundary between the Devonian-Carboniferous periods.

Around 360 million years ago, a lengthy period of biodiversity declines culminated in a series of extinction events that saw 19 percent of all families and 50 percent of all genera disappear.

Scientists have previously unearthed a diversity of Late Devonian plant spores that show evidence of being burnt by ultraviolet light, signs of a prolonged ozone-depletion event.

Aug 19, 2020

Ancient Extinction Event Likely Triggered By Nearby Supernova, Says New Paper

Posted by in categories: cosmology, existential risks

Astrophysical detectives point to a cosmic supernova explosion or explosions to explain ancient extinction events here on Earth.

Aug 19, 2020

The World’s Most Powerful X-Ray Laser Just Gave Rise to a ‘Molecular Black Hole’

Posted by in category: cosmology

Circa 2017


Imagine you took all sunlight that hits our planet at any given moment, and focussed it on one (unfortunate) piece of Earth the size of a thumbnail. Now times that blistering intensity by 100, and you’re beginning to understand the insanity of the world’s most powerful X-ray laser.

In a surprise result, scientists have focussed the full intensity of this laser onto a single molecule, and the aftermath has given rise to a phenomenon no one’s ever seen before — a molecular ‘black hole’, which consumes anything in its path.

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Aug 19, 2020

Black hole collision may have exploded with light

Posted by in categories: cosmology, education, physics

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Astronomers have seen what appears to the first light ever detected from a black hole merger.


When two black holes spiral around each other and ultimately collide, they send out ripples in space and time called gravitational waves. Because black holes do not give off light, these events are not expected to shine with any light waves, or electromagnetic radiation. Graduate Center, CUNY astrophysicists K. E. Saavik Ford and Barry McKernan have posited ways in which a black hole merger might explode with light. Now, for the first time, astronomers have seen evidence of one of these light-producing scenarios. Their findings are available in the current issues of Physical Review Letters.

A team consisting of scientists from The Graduate Center, CUNY; Caltech’s Zwicky Transient Facility (ZTF); Borough of Manhattan Community College (BMCC); and The American Museum of Natural History (AMNH) spotted what appears to be a flare of light from a pair of coalescing black holes. The event (called S190521g) was first identified by the National Science Foundation’s (NSF) Laser Interferometer Gravitational-wave Observatory (LIGO) and the European Virgo detector on May 21, 2019. As the black holes merged, jiggling space and time, they sent out gravitational waves. Shortly thereafter, scientists at ZTF — which is located at the Palomar Observatory near San Diego — reviewed their recordings of the same the event and spotted what may be a flare of light coming from the coalescing black holes.

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