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(CNN)For the first time, astronomers have captured an image of the supermassive black hole at the center of our galaxy.
It’s the first direct observation confirming the presence of the black hole, known as Sagittarius A*, as the beating heart of the Milky Way.
Black holes don’t emit light, but the image shows the shadow of the black hole surrounded by a bright ring, which is light bent by the gravity of the black hole. Astronomers said the black hole is 4 million times more massive than our sun.
“For decades, astronomers have wondered what lies at the heart of our galaxy, pulling stars into tight orbits through its immense gravity,” Michael Johnson, astrophysicist at the Center for Astrophysics | Harvard & Smithsonian, said in a statement.
“With the (Event Horizon Telescope or EHT) image, we have zoomed in a thousand times closer than these orbits, where the gravity grows a million times stronger. At this close range, the black hole accelerates matter to close to the speed of light and bends the paths of photons in the warped (space-time).”
The black hole is about 27,000 light-years away from Earth. Our solar system is located in one of the spiral arms of the Milky Way galaxy, which is why we’re so distant from the galactic center. If we could see this in our night sky, the black hole would appear to be the same size as a doughnut sitting on the moon.
“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, in a statement.
“These unprecedented observations have greatly improved our understanding of what happens at the very (center) of our galaxy, and offer new insights on how these giant black holes interact with their surroundings.”
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It has taken five years for astronomers to capture and confirm this image and discovery. Previously, scientists observed stars orbiting some invisible, massive object at the galactic center.
The 2020 Nobel Prize in physics was awarded to scientists Roger Penrose, Reinhard Genzel and Andrea Ghez for their discoveries about black holes, including evidence shared by Ghez and Genzel about the mass of the object at the center of the Milky Way.
“We now see that the black hole is swallowing the nearby gas and light, pulling them into a bottomless pit,” Ramesh Narayan, a theoretical astrophysicist at the Center for Astrophysics | Harvard & Smithsonian, said in a statement. “This image confirms decades of theoretical work to understand how black holes eat.”
The discovery was made possible by more than 300 researchers from 80 institutions working with a network of eight different radio telescopes around the globe that make up the Event Horizon Telescope.
The telescope is named after the “event horizon,” the point at which no light can escape from a black hole. This global telescope network essentially forms a single “Earth-size” virtual telescope when all eight are linked and observing in tandem.
It’s the second image ever captured of a black hole, with the first being the EHT’s achievement of imaging M87* at the heart of the distant Messier 87 galaxy, located 55 million light-years away, in 2019.
While the two images look similar, Sagittarius A* is more than 1,000 times smaller than M87*.
“We have two completely different types of galaxies and two very different black hole masses, but close to the edge of these black holes they look amazingly similar,” said Sera Markoff, cochair of the EHT Science Council and a professor of theoretical astrophysics at the University of Amsterdam, in a statement.
“This tells us that (Einstein’s theory of) General Relativity governs these objects up close, and any differences we see further away must be due to differences in the material that surrounds the black holes.”
Although the Milky Way’s black hole is closer to Earth, it was much harder to image.
“The gas in the vicinity of the black holes moves at the same speed — nearly as fast as light — around both Sgr A* and M87*,” EHT scientist Chi-kwan Chan at the Steward Observatory and Department of Astronomy and the Data Science Institute of the University of Arizona, said in a statement.
“But where gas takes days to weeks to orbit the larger M87*, in the much smaller Sgr A* it completes an orbit in mere minutes. This means the brightness and pattern of the gas around Sgr A* was changing rapidly as the EHT Collaboration was observing it — a bit like trying to take a clear picture of a puppy quickly chasing its tail.” CNN
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