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Stellar black holes are created from the collapse of massive stars at the end of their lives and are smaller than supermassive black holes whose creation is still unknown.

Astronomers discover Milky Way's largest stellar black hole with mass 33 times of Sun 

Stellar black holes are created from the collapse of massive stars at the end of their lives and are smaller than supermassive black holes whose creation is still unknown.

Astronomers identified the largest stellar black hole yet discovered in the Milky Way, with a mass 33 times that of the Sun, according to a study published on Tuesday.
The black hole, named Gaia BH3, was discovered "by chance" from data collected by the European Space Agency's Gaia mission, an astronomer from the National Centre for Scientific Research (CNRS) at the Observatoire de Paris, Pasquale Panuzzo, told AFP.
Gaia, which is dedicated to mapping the Milky Way galaxy, located BH3 2,000 light years away from Earth in the Aquila constellation.
As Gaia's telescope can give a precise position of stars in the sky, astronomers were able to characterise their orbits and measure the mass of the star's invisible companion -- 33 times that of the Sun.
Further observations from on-the-ground telescopes confirmed that it was a black hole with a mass far greater than the stellar black holes already in the Milky Way.
"No one was expecting to find a high-mass black hole lurking nearby, undetected so far. This is the kind of discovery you make once in your research life," Panuzzo said in a press release.
The stellar black hole was discovered when scientists spotted a "wobbling" motion on the companion star that was orbiting it.
"We could see a star a little smaller than the Sun (around 75 percent of its mass) and brighter, that revolved around an invisible companion," Panuzzo said.
Stellar black holes are created from the collapse of massive stars at the end of their lives and are smaller than supermassive black holes whose creation is still unknown.
Such giants have already been detected in distant galaxies via gravitational waves.
But "never in ours", said Panuzzo.
BH3 is a "dormant" black hole and is too far away from its companion star to strip it of its matter and therefore emits no X-rays -- making it difficult to detect.
Gaia's telescope identified the first two inactive black holes (Gaia BH1 and Gaia BH2) in the Milky Way.
Gaia has been operating 1.5 million kilometres from Earth for the past 10 years and in 2022 delivered a 3D map of the positions and motions of more than 1.8 billion stars.

Oldest black hole yet discovered, formed 470 million years after Big Bang

Scientist said that the oldest black hole is believed to weigh anywhere from 10 per cent to 100 per cent of the mass of all the stars in its galaxy.

Scientists have discovered the oldest black hole yet, formed a mere 470 million years after the Big Bang.
The findings, published on Monday, confirm what until now were theories that supermassive black holes existed at the dawn of the universe. NASA's James Webb Space Telescope and Chandra X-Ray Observatory teamed up to make the observations.
Given the universe is 13.7 billion years old, that puts the age of this black hole at 13.2 billion years.
Even more astounding to scientists, this black hole is a whopper &mdash; 10 times bigger than the black hole in our own Milky Way.
It's believed to weigh anywhere from 10 per cent to 100 per cent the mass of all the stars in its galaxy. That is nowhere near the minuscule ratio of the black holes in our Milky Way and other nearby galaxies, scientists said.
&ldquo;It's just really early on in the universe to be such a behemoth," said Yale University's Priyamvada Natarajan, who took part in the study published in Nature Astronomy.
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It has been a month since Event Horizon Telescope captured the first image of the black hole at the centre of the Milky Way. Since then astronomers have come across another object in the universe--a free-floating black hole. With the help of gravitational microlensing this phenomenon was spotted in deep space.
Gravitational microlensing is the process used by astronomers to observe light from a star far behind the black hole, which brightens momentarily before being deflected by an object that passes in front of it. The object is the black hole.
Astronomers from UC Berkeley estimate that the mass of this invisible compact object could be somewhere between 1.6 to 4.4 times that of the sun.
There is another opinion among astronomers that the object could be a neutron star rather than a black hole. Neutron stars are dense, highly compact objects, but their gravity is balanced by internal neutron pressure, which prevents further collapse of a black hole.
“This is the first free-floating black hole or neutron star discovered through gravitational microlensing. With microlensing, we’re able to probe these lonely, compact objects and weigh them. I think we have opened a new window onto these dark objects, which can’t be seen any other way,” Jessica Lu, a UC Berkeley associate professor of astronomy, and lead author said in a statement.
The wandering black hole lies about 5,000 light-years away, in the Carina-Sagittarius spiral arm of our galaxy. Its discovery though has paved a way for astronomers to believe that the nearest black hole to Earth might be as close as 80 light-years away.
Two teams observed the microlensing event, one from Berkley and another from the Space Telescope Science Institute (STScI) in Baltimore.
The STScI team led by Kailash Sahu estimates the black hole is traveling across the galaxy at an incredibly fast speed of 1,60,000 kilometers per hour. At that speed, one can reach Earth from the Moon in less than three hours.

Black hole or neutron star? Astronomers wonder what is the wandering object in the  Milky Way

Astronomers from UC Berkeley estimate that the mass of this invisible compact object could be somewhere between 1.6 to 4.4 times that of the sun

Astronomers from UC Berkeley estimate that the mass of this invisible compact object could be somewhere between 1.6 to 4.4 times that of the sun

Over a month since Event Horizon Telescope captured the first image of the black hole at the centre of the Milky Way, astronomers have come across another object in the universe-- a free-floating black hole. The With the help of gravitational microlensing this phenomenon was spotted in the deep space.
Gravitational microlensing is the process used by astronomers to observe light from a star far behind the black hole, which brightens momentarily before being deflected by an object that passes in front of it. The object is the black hole.
Astronomers from UC Berkeley estimate that the mass of this invisible compact object could be somewhere between 1.6 to 4.4 times that of the sun.
There is another opinion among astronomers that the object could be a neutron star rather than a black hole. Neutron stars are dense, highly compact objects, but their gravity is balanced by internal neutron pressure, which prevents further collapse of a black hole.
&ldquo;This is the first free-floating black hole or neutron star discovered through gravitational microlensing. With microlensing, we&rsquo;re able to probe these lonely, compact objects and weigh them. I think we have opened a new window onto these dark objects, which can&rsquo;t be seen any other way,&rdquo; Jessica Lu, a UC Berkeley associate professor of astronomy, and lead author said in a statement.
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The wandering black hole lies about 5,000 light-years away, in the Carina-Sagittarius spiral arm of our galaxy. Its discovery though has paved a way for astronomers to believe that the nearest black hole to Earth might be as close as 80 light-years away.
Two teams observed the microlensing event, one from Berkley and another from the Space Telescope Science Institute (STScI) in Baltimore.
The STScI team led by Kailash Sahu estimates the black hole is traveling across the galaxy at an incredibly fast speed of 1,60,000 kilometers per hour. At that speed, one can reach Earth from the Moon in less than three hours.

Matthew Lister is a professor of physics and astronomy in the College of Science at Purdue University. In this video, he describes how astronomers were able to capture the first image of the Milky Way&rsquo;s black hole, and why it is so significant. This is the second black hole ever photographed, and first of the one at the center of the Milky Way. Because of an additional telescope at the South Pole, Lister says the photo has a higher-resolution and can be studied more. He says this confirms the mass of the black hole at the center of our galaxy, which is about 4 million times the size of the sun. Lister says photos like this are important to study how gravity and quantum mechanics work together.

Explained: why the new black hole picture is so significant

This is the second black hole ever photographed, and first of the one at the center of the Milky Way. (PAL)

This is the second black hole ever photographed, and first of the one at the center of the Milky Way.

Matthew Lister is a professor of physics and astronomy in the College of Science at Purdue University. In this video, he describes how astronomers were able to capture the first image of the Milky Way&rsquo;s black hole, and why it is so significant. This is the second black hole ever photographed, and first of the one at the center of the Milky Way. Because of an additional telescope at the South Pole, Lister says the photo has a higher-resolution and can be studied more. He says this confirms the mass of the black hole at the center of our galaxy, which is about 4 million times the size of the sun. Lister says photos like this are important to study how gravity and quantum mechanics work together.

Astronomers on Thursday unveiled the first image of the supermassive black hole at the centre of our own Milky Way galaxy.
The finding, published in The Astrophysical Journal Letters, provides overwhelming evidence that the object is indeed a black hole and yields valuable clues about the workings of such giants, which are thought to reside at the centre of most galaxies.
The image was produced by a global research team called the Event Horizon Telescope (EHT) Collaboration, using observations from a worldwide network of radio telescopes.
The finding was unveiled during simultaneous press conferences around the world, including at the European Southern Observatory (ESO) headquarters in Germany.
The image is a long-anticipated look at the massive object that sits at the very centre of our galaxy. Scientists had previously seen stars orbiting around something invisible, compact, and very massive at the centre of the Milky Way.
This strongly suggested that this object — known as Sagittarius A* (Sgr A* ) is a black hole, and the image provides the first direct visual evidence of it.
Although we cannot see the black hole itself, because it is completely dark, glowing gas around it reveals a tell-tale signature: a dark central region (called a shadow) surrounded by a bright ring-like structure, the researchers said.
The new view captures light bent by the powerful gravity of the black hole, which is four million times more massive than our Sun, they said.
“We were stunned by how well the size of the ring agreed with predictions from Einstein’s Theory of General Relativity," said EHT Project Scientist Geoffrey Bower from the Institute of Astronomy and Astrophysics, Academia Sinica, Taipei.
"These unprecedented observations have greatly improved our understanding of what happens at the very centre of our galaxy, and offer new insights on how these giant black holes interact with their surroundings," Bower said.
Because the black hole is about 27 000 light-years away from Earth, it appears to us to have about the same size in the sky as a doughnut on the Moon.
To image it, the team created the powerful EHT, which linked together eight existing radio observatories across the planet to form a single “Earth-sized” virtual telescope.
The EHT observed Sgr A* on multiple nights in 2017, collecting data for many hours in a row, similar to using a long exposure time on a camera. 

 Astronomers reveal first image of black hole at the heart of our galaxy

The image was produced by a global research team called the Event Horizon Telescope Collaboration, using observations from a worldwide network of radio telescopes.

The image was produced by a global research team called the Event Horizon Telescope Collaboration, using observations from a worldwide network of radio telescopes.

Astronomers on Thursday unveiled the first image of the supermassive black hole at the centre of our own Milky Way galaxy.
The finding, published in The Astrophysical Journal Letters, provides overwhelming evidence that the object is indeed a black hole and yields valuable clues about the workings of such giants, which are thought to reside at the centre of most galaxies.
The image was produced by a global research team called the Event Horizon Telescope (EHT) Collaboration, using observations from a worldwide network of radio telescopes.
The finding was unveiled during simultaneous press conferences around the world, including at the European Southern Observatory (ESO) headquarters in Germany.
The image is a long-anticipated look at the massive object that sits at the very centre of our galaxy. Scientists had previously seen stars orbiting around something invisible, compact, and very massive at the centre of the Milky Way.
This strongly suggested that this object &mdash; known as Sagittarius A* (Sgr A* ) is a black hole, and the image provides the first direct visual evidence of it.
Although we cannot see the black hole itself, because it is completely dark, glowing gas around it reveals a tell-tale signature: a dark central region (called a shadow) surrounded by a bright ring-like structure, the researchers said.
The new view captures light bent by the powerful gravity of the black hole, which is four million times more massive than our Sun, they said.
&ldquo;We were stunned by how well the size of the ring agreed with predictions from Einstein&rsquo;s Theory of General Relativity," said EHT Project Scientist Geoffrey Bower from the Institute of Astronomy and Astrophysics, Academia Sinica, Taipei.
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"These unprecedented observations have greatly improved our understanding of what happens at the very centre of our galaxy, and offer new insights on how these giant black holes interact with their surroundings," Bower said.
Because the black hole is about 27 000 light-years away from Earth, it appears to us to have about the same size in the sky as a doughnut on the Moon.
To image it, the team created the powerful EHT, which linked together eight existing radio observatories across the planet to form a single &ldquo;Earth-sized&rdquo; virtual telescope.
The EHT observed Sgr A* on multiple nights in 2017, collecting data for many hours in a row, similar to using a long exposure time on a camera.&nbsp;

Indian researchers have discovered three supermassive black holes from as many galaxies merging together to form a triple active galactic nucleus, the Department of Science and Technology said on Friday.
Supermassive black holes are difficult to detect because they do not emit any light but they can reveal their presence by interacting with their surroundings, the department&nbsp;said.&nbsp;
Supermassive black holes&nbsp;contain between a million and a billion times more&nbsp;mass&nbsp;than a typical black hole. Although there are only a handful of confirmed supermassive black holes, they are thought to exist at the centre of most large&nbsp;galaxies, including our own&nbsp;galaxy, the&nbsp;Milky Way.
&nbsp;

Indian researchers find 3 supermassive black holes merging in nearby universe

Indian researchers have discovered three supermassive black holes from as many galaxies merging together to form a triple active galactic nucleus

Three supermassive black holes from as many galaxies merging together
The rare galactic event&nbsp;was been discovered by Indian researchers
Supermassive black holes are difficult to detect because they do not emit any light

Supermassive black holes&nbsp;contain between a million and a billion times more&nbsp;mass&nbsp;than a typical black hole

Indian researchers have discovered three supermassive black holes from as many galaxies merging together to form a triple active galactic nucleus, the Department of Science and Technology said on Friday.
Supermassive black holes are difficult to detect because they do not emit any light but they can reveal their presence by interacting with their surroundings, the department&nbsp;said.&nbsp;
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Supermassive black holes&nbsp;contain between a million and a billion times more&nbsp;mass&nbsp;than a typical black hole. Although there are only a handful of confirmed supermassive black holes, they are thought to exist at the centre of most large&nbsp;galaxies, including our own&nbsp;galaxy, the&nbsp;Milky Way.
&nbsp;

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