The black holes at the centers of galaxies are the most mysterious objects in the Universe, not only because of the huge quantities of material within them, millions of times the mass of the Sun, but because of the incredibly dense concentration of matter in a volume no bigger than that of our Solar System. ...
A new theoretical study has proposed a novel mechanism for the creation of supermassive black holes from dark matter. The international team finds that rather than the conventional formation scenarios involving “normal” matter, supermassive black holes could instead form directly from dark matter in high-density regions in the centers of galaxies. The result has key ...
An international team of astronomers has published a map of the sky showing over 25,000 supermassive black holes. The map, to be published in the journal Astronomy & Astrophysics, is the most detailed celestial map in the field of so-called low radio frequencies. The astronomers, including Leiden astronomers, used 52 stations with LOFAR antennas spread ...
A recent study suggests the possible existence of “stupendously large black holes” or SLABS, even larger than the supermassive black holes already observed in the centers of galaxies. The research, led by Queen Mary Emeritus Professor Bernard Carr in the School of Physics and Astronomy, together with F. Kühnel (Münich) and L. Visinelli (Frascati), investigated ...
A new Columbia study indicates energy can be extracted from black holes through the reconnection of magnetic field lines. A remarkable prediction of Einstein’s theory of general relativity — the theory that connects space, time, and gravity — is that rotating black holes have enormous amounts of energy available to be tapped. For the last ...
When a black hole chews up a star, it produces visible light or X-rays, but astronomers have almost never detected both types of radiation. Astronomer Peter Jonker (SRON/Radboud University) and his colleagues have now spotted a number of captured stars with an X-ray telescope a few years after they were discovered in optical light. It ...
Black holes are an important part of how astrophysicists make sense of the universe — so important that scientists have been trying to build a census of all the black holes in the Milky Way galaxy. But new research shows that their search might have been missing an entire class of black holes that they ...
The orbit of objects in the Kuiper Belt located at the edge of the solar system tilts the same way and points in the same direction. As a result, researchers have theorized that there might be a mysterious planet, dubbed Planet 9, lurking somewhere and exerting a gravitational pull on the objects. A new theory ...
Suppose Albert Einstein’s theory of general relativity holds. In that case, a black hole, born from the cosmically quaking collisions of two massive black holes, should itself “ring” in the aftermath, producing gravitational waves much like a struck bell reverberating sound waves. Einstein predicted that these gravitational waves’ particular pitch and decay should be a ...
Scientists, including from The Australian National University (ANU), say they have detected a black hole swallowing a neutron star for the first time. These are the super-dense remains of dead stars. On Wednesday 14 August 2019, gravitational-wave discovery machines in the United States and Italy detected ripples in space and time from a cataclysmic event ...
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