Far away among the stars, in the Ara constellation of the southern sky, a small black hole is whirling space around it. If you tried to stay still in its vicinity, you couldnt. Youd be dragged around at high speed as if you were riding on a giant flywheel.
In reality, gas falling into the black hole is whirled in that way. It radiates energy, in the form of X-rays, more intensely than it would do if space were still by tapping into the black holes internal energy stream.
ESAs big X-ray detecting satellite, XMM-Newton, was specifically designed to detect this form of energy. With this finding it has chalked up another notable success in its investigations of the black holes - mysterious regions of space where gravity is so strong that light cant escape. High speeds and intense gravity affect the energy of X-rays emitted from iron atoms very close to a black hole. By detecting the resulting spread of energies, with XMM-Newton, astronomers can diagnose the conditions there.
The weird effect of a spinning black hole on its surroundings is linked to Albert Einsteins theory of gravity, in which the fabric of space itself becomes fluid. XMM-Newton first discovered such black-hole flywheels in galaxies many millions of light-years away. Now, in findings to be formally reported next month, it sees the same thing much closer to home, in our own Galaxy, the Milky Way.
Monica Talevi | ESA
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22.02.2017 | Carnegie Institution for Science
On January 15, 2009, Chesley B. Sullenberger was celebrated world-wide: after the two engines had failed due to bird strike, he and his flight crew succeeded after a glide flight with an Airbus A320 in ditching on the Hudson River. All 155 people on board were saved.
On January 15, 2009, Chesley B. Sullenberger was celebrated world-wide: after the two engines had failed due to bird strike, he and his flight crew succeeded...
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The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.
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