Astronomers reveal first image of black hole at the center of the Milky Way.
By William Harwoodin a galaxy 55 million light years away, astronomers have managed to"photograph" the gaping maw of the smaller but much closer black hole quietly lurking at the core of the Milky Way, researchers announced Thursday.
A combination of photos comparing the black hole at the center of the Milky Way, known as Sagittarius A*, or Sgr A* and the one at the core of M-87 .Now, after years of careful data collection using eight radio telescope electronically combined and synchronized with atomic clocks to form a virtual dish the size of planet Earth, collaborators with the Event Horizon Telescope project unveiled the long-sought-after image of Sgr A*.
The image, based on multiple observations using a variety of algorithms to tease out subtle details,"shows a bright ring surrounding the darkness, the telltale sign of the shadow of the black hole," Özel said. The motions of stars in the dust-shrouded core of the Milky Way near Sgr A* have been closely monitored for the past two decades, allowing astronomers to calculate the mass of the invisible body warping their trajectories.
The EHT image of Sgr A* is similar in appearance to the historic image of M-87's huge black hole and closely resembles what astronomers expected based on computer simulations running the equations of Einstein's general theory of relativity. While M-87 features one of the most massive black holes in the known universe, Sgr A*"is giving us a view into the much more standard state of black holes, quiet and quiescent," he said."M-87 was exciting because it was the extraordinary. Sgr A* is exciting because it's common."To"see" Sgr A*, the Event Horizon Telescope team used an array of eight radio telescopes in Hawaii, North, Central and South America, Europe and Antarctica.
Stable stars live in a state of"hydrostatic equilibrium," balancing the inward force of gravity with the outward push of radiation generation by fusion reactions in the core. In the sun, 600 million tons of hydrogen are fused into helium every second to produce the outward radiation pressure needed to offset gravity and maintain stability.
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