“Fossil of the Universe” –Extremely Elusive Axion Dark-Matter Signal

 

Dark Matter

 

“While it is certainly possible that axions — a hypothetical elementary particle predicted to be among the lightest particles in the universe–make up dark matter, they also may make up a source of “dark radiation” in our universe which we refer to as the Cosmic Axion Background (CaB), analogous to the observed Standard Model radiation, known as the Cosmic Microwave Background,” Jeff Dror, with the Santa Cruz Institute for Particle Physics, told The Daily Galaxy. “Furthermore,” adds Dror, “experiments designed to search for axion dark matter can be repurposed to search for the CaB and potentially lead to the discovery of the axion, which would also teach us a great deal about the history of our universe.”

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“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.

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“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.

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Origin of Information Was Like an Extraterrestrial Invasion to ‘Weirdest’ Matter Defies Description –Planet Earth Report

Planet Earth

 

“Planet Earth Report” provides descriptive links to headline news by leading science journalists about the extraordinary discoveries, technology, people, and events changing our knowledge of Planet Earth and the future of the human species.

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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.

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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.

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