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These two black holes are just 40 orbits away from merging in this simulation of the light their environment emits as they dance. Download the desktop version here.Download the smartphone version here.Credit: NASA's Goddard Space Flight Center"type="image/png">
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The central region of our galaxy, the Milky Way, contains an exotic collection of objects, including a supermassive black hole weighing about 4 million times the mass of the Sun, clouds of gas at temperatures of millions of degrees, neutron stars and white dwarf stars tearing material from companion stars, and beautiful tendrils of radio emission. This new composite image shows Chandra data (green and blue) combined with radio data (red) from the MeerKAT telescope in South Africa. Download the desktop version here.Download the smartphone version here.Credit: X-Ray:NASA/CXC/UMass/D. Wang et al.; Radio:NRF/SARAO/MeerKAT "type="image/png">
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Spectacular jets powered by the gravitational energy of a supermassive black hole in the core of the elliptical galaxy Hercules A as imaged by Hubble Space Telescope's Wide Field Camera 3 and the Karl G. Jansky Very Large Array (VLA) radio telescope in New Mexico.Download the desktop version here.Download the smartphone version here.Credit: NASA, ESA, S. Baum and C. O'Dea (RIT), R. Perley and W. Cotton (NRAO/AUI/NSF), and the Hubble Heritage Team (STScI/AURA)"type="image/png">
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The Galactic Center or Galactic Centre is the rotational center, the barycenter, of the Milky Way galaxy.[1][2] Its central massive object is a supermassive black hole of about 4 million solar masses, which is called Sagittarius A*,[3][4][5] a compact radio source which is almost exactly at the galactic rotational center. The Galactic Center is approximately 8 kiloparsecs (26,000 ly) away from Earth[3] in the direction of the constellations Sagittarius, Ophiuchus, and Scorpius, where the Milky Way appears brightest, visually close to the Butterfly Cluster (M6) or the star Shaula, south to the Pipe Nebula.
Immanuel Kant stated in Universal Natural History and Theory of the Heavens (1755) that a large star was at the center of the Milky Way Galaxy, and that Sirius might be the star.[6] Harlow Shapley stated in 1918 that the halo of globular clusters surrounding the Milky Way seemed to be centered on the star swarms in the constellation of Sagittarius, but the dark molecular clouds in the area blocked the view for optical astronomy.[7] In the early 1940s Walter Baade at Mount Wilson Observatory took advantage of wartime blackout conditions in nearby Los Angeles to conduct a search for the center with the 100-inch (250 cm) Hooker Telescope. He found that near the star Alnasl (Gamma Sagittarii) there is a one-degree-wide void in the interstellar dust lanes, which provides a relatively clear view of the swarms of stars around the nucleus of the Milky Way Galaxy.[8] This gap has been known as Baade's Window ever since.[9]
Star formation does not seem to be occurring currently at the Galactic Center, although the Circumnuclear Disk of molecular gas that orbits the Galactic Center at two parsecs seems a fairly favorable site for star formation. Work presented in 2002 by Antony Stark and Chris Martin mapping the gas density in a 400-light-year region around the Galactic Center has revealed an accumulating ring with a mass several million times that of the Sun and near the critical density for star formation. They predict that in approximately 200 million years there will be an episode of starburst in the Galactic Center, with many stars forming rapidly and undergoing supernovae at a hundred times the current rate. This starburst may also be accompanied by the formation of galactic relativistic jets as matter falls into the central black hole. It is thought that the Milky Way undergoes a starburst of this sort every 500 million years. 041b061a72