Dark Hearts of the Cosmos –Dazzling New Mergers of Black Holes and Neutron Stars


Black Holes in Globular Clusters


“Mergers of black holes with neutron stars are exceptionally rare in the Universe.  “An actual merger of a neutron star with a black hole happens, perhaps, once every million years in a galaxy.  To see one in the Milky Way, we would have to watch for a very long time,” Harald Pfeiffer, group leader in the Astrophysical and Cosmological Relativity department at Max Planck Institute for Gravitational Physics (AEI) in Potsdam, Germany, told The Daily Galaxy about recent neutron star-black hole merger of GW200105, detected by LIGO and Virgo in the past five years that have opened a completely new new way of observing the Universe.


“All the Light”– In the History of the Observable Universe

Galaxies in Milky Way


From our tiny blue dot, the universe appears inconceivably vast. In the grand cosmic scheme of things, all the light in the observable universe provides about as much illumination as a 60-watt bulb seen from 2.5 miles away, says Marco Ajello, an astrophysicist at Clemson University, who led a team in 2018 that has measured all of the starlight ever produced throughout the history of the observable universe.


Unknown Objects in Inner-Most Orbit of Milky Way’s Supermassive Black Hole 

Milky Way Black Hole


“It’s mind-boggling to actually witness material orbiting a massive black hole at 30% of the speed of light,” marveled Oliver Pfuhl, a scientist at the Max Planck Institute for Extraterrestrial Physics.


Mystery Objects Detected Near Milky Way’s Supermassive Black Hole





In 2018, astronomers discovered several bizarre objects at the Galactic Center using 12 years of data taken from W. M. Keck Observatory on Mauna Kea, Hawaii. The objects are concealing their true identity behind an opaque screen of dust; they look like gas clouds, but behave like stars. “These compact dusty stellar objects move extremely fast and close to our Galaxy’s supermassive black hole. It is fascinating to watch them move from year to year,” said astronomer Anna Ciurlo at UCLA. “How did they get there? And what will they become? They must have an interesting story to tell.”  (more…)

Beyond Einstein –“Quantum Gravity Casts Doubt On Fate of Black Holes”


LIGO Black Hole



“The fate of black holes in a quantum theory of gravity is, in my view, the most important problem in theoretical physics,” said Jorge Pullin, the Horace Hearne professor of theoretical physics at LSU.


“Deeply Compelling” –Weird Existence of Primordial Black Holes in the Early Universe



Astronomers studying the motions of galaxies and the character of the cosmic microwave background radiation came to realize in the last century that most of the matter in the universe was not visible. About 84 percent of the matter in the cosmos is dark matter, much of it located in halos around galaxies. It was dubbed dark matter because it does not emit light, but it is also mysterious: it is not composed of atoms or their usual constituents like electrons and protons.