Researchers at the Laser Interferometer Gravitational-Wave Observatory (LIGO) in the U.S. and the Virgo Observatory in Italy first detected the waves—ripples in the fabric of space-time—in May 2019. The two smashed black holes at the heart of the collision were 66 and 85 times more massive than our sun, astronomers report in two papers published last week in Physical Review Letters and The Astrophysical Journal .
A black hole 85 times the mass of our sun theoretically shouldn't exist. It doesn't pair well with the theories researchers have about how stars die. Stars that range from a few times to 60 times the mass of our sun typically burn all of their fuel and eventually collapse in on themselves, forming a "conventional" black hole.
Quite a lot has been going on:
What Does It Mean When You Discover A Black Hole That Shouldn't Even Exist?
The largest black hole merger ever detected by gravitational waves confirms the existence of an intermediate-mass black hole.
One of the black holes that merged to form the bigger black hole shouldn't even exist according to our models for stellar evolution.
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As active as the human imagination is about these cosmic giants, black hole physics itself has been dynamic, and a new development promises to stretch our understanding.
Scientists discover first ... black hole - Big Think
In May 2019, a ripple of gravitational waves passed through Earth after traveling across the cosmos for 7 billion years. The ripple came in four waves, each lasting just a fraction of a second. Although the ancient signal was faint, its source was cataclysmic: the biggest merger of two black holes ever observed.
It occurred when two mid-sized black holes — 66 and 85 times the mass of our Sun — drifted close together, began spinning around each other and merged into one black hole roughly 142 times the mass of our Sun.
How to have a blast like a black hole -- ScienceDaily
Laser Engineering at Osaka University have successfully used short, but extremely powerful laser blasts to generate magnetic field reconnection inside a plasma. This work may lead to a more complete theory of X-ray emission from astronomical objects like black holes.
In addition to being subjected to extreme gravitational forces, matter being devoured by a black hole can be also be pummeled by intense heat and magnetic fields. Plasmas, a fourth state of matter hotter than solids, liquids, or gasses, are made of electrically charged protons and electrons that have too much energy to form neutral atoms. Instead, they bounce frantically in response to magnetic fields.
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The same black hole can collide with its kin multiple times, lopsided merger suggests | Space
On April 12, 2019, scientists detected a new black-hole merger using a trio of gravitational-wave detectors. Astrophysicists have spotted such events before, but something about the signals was different this time: the two black holes that collided were incredibly unevenly matched , with the larger about three times the size of the smaller. Scientists didn't expect to see such an imbalanced merger between black holes, and now, they think they might understand the unusual event.
Researchers Find the Origin and Maximum Mass of Massive Black Holes Observed by Gravitational
Figure 1: Schematic diagram of the binary black hole formation path for GW170729. A star below 80 solar mass evolves and develops into a core-collapse supernova. The star does not experience pair-instability, so there is no significant mass ejection by pulsation. After the star forms a massive iron core, it collapses by its own gravity and forms a black hole with a mass below 38 solar mass. A star between 80 and 140 solar mass evolves and develops into a pulsational pair-instability supernova.
Lopsided "David and Goliath" Black Hole Merger With an Oddball Origin Story
A lopsided merger of two black holes may have unusual origins, based on a reanalysis of LIGO data. Credit: MIT News
Now the new study, published on September 2, 2020, in the journal Physical Review Letters, shows that this lopsided merger may have originated through a very different process compared to how most mergers, or binaries, are thought to form.
GW190412 may then be a second generation, or “hierarchical” merger, standing apart from other first-generation mergers that LIGO and Virgo have so far detected.
'Alien' black hole sends a massive shock wave through the universe
Astronomers have discovered a supermassive gravitational wave from a black hole that simply shouldn’t exist.
The black hole is 142 times the mass of the sun and sent the largest gravitational wave ever recorded. In total, the black hole sent out the equivalent of eight sun’s worth of energy across the universe.
Gravitational waves are ripples in spacetime that can be detected from Earth. And scientists are still very much unsure how the black hole was created.
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