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We study the gravity field of Earth from orbit, and fly experiments on parabolic flights, sounding rockets and the International Space Station to examine a variety of systems under different gravitational conditions. In some galaxies, there are even binary systems of supermassive black holes, see the OJ 287 system. The moderate spin for this ultramassive object may be a testament to the violent. A supermassive black hole (SMBH) is an extremely large black hole, on the order of hundreds of thousands to billions of solar masses ( M ), and is theorized to exist in the center of almost all massive galaxies. Space agencies such as ESA routinely launch spacecraft against our planet’s gravity, and sometimes these spacecraft borrow the gravity of Earth or other planets to reach interesting places in the Solar System. Most black holes spin rapidly, but this one is a bit of an outlier. We feel it, we fight it, and – more importantly – we investigate it. On Earth, we deal with gravity every day. More information: A unique experiment to explore black holes We have never observed merging supermassive black holes – we do not yet have the facilities for such observations. Combining the observing power of two future ESA missions, Athena and LISA, would allow us to study these cosmic clashes and their mysterious aftermath for the first time. First, we need LISA to detect the gravitational waves and tell us where to look in the sky then we need Athena to observe with high precision in X-rays to see how the mighty collision affects the gas surrounding the black holes. When two supermassive black holes collide during a merger of galaxies, we expect them to release gravitational waves – fluctuations in the fabric of spacetime. Simulations predict that these mergers, unlike those of their stellar-mass counterparts, emit both gravitational waves and radiation – the latter originating in the hot, interstellar gas of the two colliding galaxies stirred by the black holes pair when they fall towards one another. We don’t know exactly how these huge, enormously dense objects took shape, nor what triggers a fraction of them to start devouring the surrounding matter at extremely intense rates, radiating copiously across the electromagnetic spectrum and turning their host galaxies into ‘active galactic nuclei’. According to Einstein's theory of relativity, time flows more slowly in strong gravitational fields, like those of these gargantuan celestial objects.Supermassive black holes, with masses ranging from millions to billions of Suns, sit at the core of most massive galaxies across the Universe. A black hole is most often created when a massive star dies and collapses on itself. "We do know that black holes are extraordinary phenomena, so it is no surprise that the most extreme specimens defy the rules that we have established up until now," Hlavacek-Larrondo said. This puts them in a class of extreme heavyweights that certain astronomers call "ultramassive black holes." "We have discovered black holes that are far larger and way more massive than anticipated," said Mar Mezcua, postdoctoral fellow at the Institute of Space Sciences. Almost half of the sample's black holes are estimated to be at least 10 billion times more massive than the Sun, said Julie Hlavacek-Larrondo, professor at University of Montreal. The results showed that the masses of ultramassive black holes are roughly 10 times greater than those originally projected. Astronomers calculated the masses of black holes detected in these galaxy clusters by analysing their radio wave and X-ray emissions.
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Researchers at University of Montreal in Canada, and Institute of Space Sciences in Spain, studied 72 galaxies located at the centre of the universe's brightest and most massive galaxy clusters. The dark area in the center is the event horizon, where light cannot avoid gravitational. A black hole is an invisible celestial object whose gravitational pull is so strong that neither matter nor light can escape it. The picture shows a supermassive black hole in the galactic core. The results, published in the journal Monthly Notices of the Royal Astronomical Society, showed that these ultramassive black holes are growing faster than the stars in their respective galaxies. The discovery was made using data collected by NASA's Chandra X-ray telescope on galaxies up to 3.5 billion light years away from Earth, researchers said. TORONTO: Astronomers have detected what are likely to be the most massive black holes ever discovered in the universe.