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Could we harness energy from black holes?

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A remarkable prediction of Einstein s theory of general relativity the theory that connects space, time, and gravity is that rotating black holes have enormous amounts of energy available to be tapped.
For the last 50 years, scientists have tried to come up with methods to unleash this power. Nobel physicist Roger Penrose theorized that a particle disintegration could draw energy from a black hole; Stephen Hawking proposed that black holes could release energy through quantum mechanical emission; while Roger Blandford and Roman Znajek suggested electromagnetic torque as a main agent of energy extraction.
Now, in a study published in the journal
Physical Review D, physicists Luca Comisso from Columbia University and Felipe Asenjo from Universidad Adolfo Ibanez in Chile, found a new way to extract energy from black holes by breaking and rejoining magnetic field lines near the event horizon, the point from which nothing, not even light, can escape the black ....

Vyacheslav Slava Lukin , Roman Znajek , Stephen Hawking , Roger Penrose , Luca Comisso , Universidad Adolfo Ibanez , Universidad Adolfo Ib , Felipe Asenjo , Roger Blandford , Chile National Fund For Scientific , National Science Foundation Windows , National Science Foundation , Technological Development , Columbia University , Universidad Adolfo , Event Horizon Telescope , National Fund , National Science , Space Planetary Science , ஸ்டீபன் ஹாக்கிங் , ரோஜர் பென்ரோஸ் , ஃபெலிப் அசெஞ்ஜோ , ரோஜர் பிளாண்ட்ஃபோர்ட் , சிலி தேசிய நிதி க்கு அறிவியல் , தேசிய அறிவியல் அடித்தளம் ஜன்னல்கள் , தேசிய அறிவியல் அடித்தளம் ,

NASA shares Hubble image of dazzling supernova-prone 'fireworks galaxy' NGC 6946- Technology News, Firstpost

NASA shares Hubble image of dazzling supernova-prone fireworks galaxy NGC 6946
Stargazers are able to marvel at NGC 6946 with a telescope since it is a face-on galaxy, that observers see it facing them at all times.
Jan 13, 2021 13:57:49 IST
The American space agency NASA periodically shares spellbinding images of outer space, revealing ethereal and unseen sights in vivid and dreamy detail. On Friday, the agency
shared previously unseen views of the NGC 6946 galaxy, better known as the Fireworks Galaxy , which witnesses frequent volatile supernovae that lends to the illusion of a fireworks display. The image shows a supernovae from the NGC 6946, one of ten observed in the galaxy, according to NASA. In comparison to NGC 6946, the Milky Way averages just one to two supernova events per century, the agency said in a statement. ....

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NASA missions unmask magnetar eruptions in nearby galaxies

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IMAGE: The giant flare, cataloged as GRB 200415A, reached detectors on different NASA spacecraft at different times. Each instrument pair established its possible location in different swaths of the sky, but.
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Credit: NASA s Goddard Space Flight Center and Adam Block/Mount Lemmon SkyCenter/University of Arizona
On April 15, 2020, a brief burst of high-energy light swept through the solar system, triggering instruments on several NASA and European spacecraft. Now, multiple international science teams conclude that the blast came from a supermagnetized stellar remnant known as a magnetar located in a neighboring galaxy.
This finding confirms long-held suspicions that some gamma-ray bursts (GRBs) - cosmic eruptions detected in the sky almost daily - are in fact powerful flares from magnetars relatively close to home. ....

Orenburgskaya Oblast , United States , Stanford University , Nicola Omodei , Eric Burns , Oliver Roberts , Kevin Hurley , University Of California , Russian High Energy Neutron Detector , Interplanetary Network , Technology Institute In Huntsville , Louisiana State University In Baton Rouge , Space Sciences Laboratory , Universities Space Research Association Science , European Space Agency , American Astronomical Society , Senior Space Fellow , American Astronomical , Milky Way , Red Planet , Russian Konus , Gamma Ray Space Telescope , Atmosphere Space Interactions Monitor , International Space , Burst Alert Telescope , Gehrels Swift Observatory ,

UChicago undergrads discover bright lensed galaxy in the early Universe

Class turned research collaboration uses ‘nature’s telescope’ to reach across cosmic time
The night sky is a natural time machine, used by cosmologists to explore the origins and evolution of the universe. Reaching into the depths of the past, a class of undergraduate students at the University of Chicago sought to do the same and uncovered an extraordinarily distant galaxy in the early cosmos.
Light emitted from faraway celestial objects takes a long time to reach Earth-side observers. That means the stars and galaxies we see in the sky appear to us as they would have existed millions, or even billions, of years ago. ....

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Rare star's giant gamma-ray burst GRB 204015A captured close to our home galaxy

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VIDEO: (90 second, 9.5MB video) On April 15 2020, a giant wave of X-rays and gamma rays lasting only a fraction of a second swept across the solar system, triggering.
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Credit: Animation: NASA s Goddard Space Flight Center/Chris Smith (USRA/GESTAR).
Video: Therese van Wyk, University of Johannesburg.
Earth gets blasted by mild short gamma-ray bursts (GRBs) most days. But sometimes a giant flare like GRB 200415A arrives at our galaxy, sweeping along energy that dwarfs our sun. In fact, the most powerful explosions in the universe are gamma-ray bursts.
Now scientists have shown that GRB 200415A came from another possible source for short GRBs. It erupted from a very rare, powerful neutron star called a magnetar. ....

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