Halloween is a time to be haunted by ghosts, goblins, and ghouls, but nothing in the universe is scarier than a black hole.
Black holes – regions in space where gravity is so strong that nothing can escape – are a hot topic in the news these days. Half of the 2020 Nobel Prize in Physics was awarded to Roger Penrose for his mathematical work showing that black holes are an inescapable consequence of Einstein's theory of gravity. Andrea Ghez and Reinhard Genzel shared the other half for showing that a massive black hole sits at the center of our galaxy .
Quite a lot has been going on:
No, Stephen Hawking's Black Hole Information Paradox Hasn't Been Solved
The event horizon of a black hole is a spherical or spheroidal region from which nothing, not even ... [+] light, can escape. But outside the event horizon, the black hole is predicted to emit radiation. Hawking's 1974 work was the first to demonstrate this, but that work has also led to a paradox that has not yet been resolved.
In a Schwarzschild black hole, falling in leads you to the singularity, and darkness. Yet, whatever ... [+] falls in contains information, while the black hole itself, at least in General Relativity, is defined only by its mass, charge, and angular momentum.
What we can learn from a mass of black hole mergers, and ecological insights from 30 years of
First up, host Sarah Crespi talks with Staff Writer Adrian Cho about new gravitational wave detections from the first half of 2019—including 37 new black hole mergers. With so many mergers now recorded, astrophysicists can do different kinds of research into things like how new pairs of black holes come to be and how often they merge.
Sarah also talks with Sarah Davidson , data curator at the Max Planck Institute of Animal Behavior, about results from an Arctic animal tracking project that includes 3 decades of location information on many species, from soaring golden eagles to baby caribou taking their first steps.
Slow Spin of the Milky Way's Supermassive Black Hole
This image is part of a simulation showing the orbits of stars very close to the supermassive black hole at the heart of the Milky Way. Observing the stellar orbits of these stars, known as S-stars, allowed scientists to measure the spin of SgrA* and determine that it doesn’t have a jet. Credit: ESO/L. Calçada/spaceengine.org
Supermassive black holes like SgrA*, the black hole at the center of our galaxy, hold a great influence over the formation of the galaxy they inhabit. Determining that the spin of SgrA* is low will have major implications for research focused on imaging the black hole and indicates a low probability of a jet existing alongside it.
Check out this next:
Final dance of unequal black hole partners
He lost that bet when, in 2005, Carlos Lousto, then at The University of Texas at Brownsville, and his team generated a solution using the Lonestar supercomputer at the Texas Advanced Computing Center. (Concurrently, groups at NASA and Caltech derived independent solutions.)
In 2015, when the Laser Interferometer Gravitational-Wave Observatory (LIGO) first observed such waves, Lousto was in shock.
"It took us two weeks to realize this was really from nature and not from inputting our simulation as a test," said Lousto, now a professor of mathematics at Rochester Institute of Technology (RIT). "The comparison with our simulations was so obvious. You could see with your bare eyes that it was the merger of two black holes."
Feeding a galaxy's nuclear black hole
Black hole-sized magnetic fields could be created on Earth, study says | Space
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