The globular cluster NGC 6397, a conglomeration of stars about 7,800 light-years from Earth, likely harbors a clump of small black holes at its heart, a new study reports.
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Researchers studied the movement of stars in NGC 6397 using NASA's Hubble Space Telescope and the European Space Agency's Gaia spacecraft . These motions revealed the existence of a hidden mass at the cluster's center — a "central dark component" that makes up 0.8 to 2% of NGC 6397's total mass.
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'Black Holes: The Edge of All We Know' documentary dives into a historic photo 1st (exclusive
"We have a goal that's never been done before: We want to take the first picture of a black hole , something that struggles with all of its might to be unseen."
The new trailer for the upcoming documentary "Black Holes: The Edge of All We Know" — exclusively provided to Space.com — opens with these words, spoken by Event Horizon Telescope (EHT) founding director Shep Doeleman. As we all know, the international EHT team achieved that audacious goal, capturing an image of the supermassive black hole at the heart of the galaxy M87.
Hubble researchers find a gaggle of small black holes
The group likely formed as the black holes fell toward the cluster's center through gravitational interactions with smaller stars. Heavier stars tend to gravitate toward the middle even when they haven't collapsed into black holes.
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Could we harness energy from black holes? | NSF - National Science Foundation
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.
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Now, in a U.S. National Science Foundation -funded study published in Physical Review D , physicists Luca Comisso of Columbia University and Felipe Asenjo of the Universidad Adolfo Ibáñez in Chile have found a new way to extract energy from black holes by breaking and rejoining magnetic field lines near the event horizon, the point at which nothing, not even light, can escape a black hole's gravitational pull.
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A Supermassive Black Hole Sheds Light on Early Universe – Now. Powered by Northrop Grumman
Astronomers at the European Southern Observatory (ESO) in Chile have discovered a clump of six galaxies surrounding a supermassive black hole. The six galaxies are among the most distant ever observed. And, because looking across cosmic distances is also like looking back in time, these galaxies are also among the most ancient objects we know of. According to Science Daily , we are observing them at a time less than a billion years after the Big Bang, close to 13 billion years ago.
Don't Tell Einstein, but Black Holes Might Have 'Hair' | WIRED
Identical twins have nothing on black holes. Twins may grow from the same genetic blueprints, but they can differ in a thousand ways—from temperament to hairstyle. Black holes, according to Albert Einstein's theory of gravity, can have just three characteristics—mass, spin and charge. If those values are the same for any two black holes, it is impossible to discern one twin from the other. Black holes, they say, have no hair.
"In classical general relativity, they would be exactly identical," said Paul Chesler, a theoretical physicist at Harvard University. "You can't tell the difference."
Did we just see two black holes merge? | astrobites
Title: Candidate Ele ctromagnetic Counterpart to the Binary Black Hole Merger Gravitational-Wave Event S190521g
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When two dense bodies such as black holes or neutron stars collide, they emit gravitational waves . For neutron stars in particular, the gravitational waves can be accompanied by radiation coming from material ejected during the merger. By contrast, as neither light nor material can escape black holes, we do not expect merging black holes to emit radiation. However, today's paper reports that if the conditions are just right, a black hole merger can also emit light.
Black hole: Indian astronomers spot a flare from very rare black hole | India News - Times of
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