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Re: Wham! Bullseye! Galactic collision creates a ring of black holes and neutron stars

Community Guru
Ravindra B Member Since: Sep 27, 2015
81 of 128

Astronomers have detected radio waves from our own galaxy bouncing off the moon

 

“The signal was picked up by researchers from the Curtin University node of the International Centre for Radio Astronomy Research (ICRAR) and the ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D). But even though that's cool enough, it's not the end goal.

 

“Their target is something much more elusive: they want to detect the extremely faint signal emanating from the hydrogen in the very earliest days of the Universe, in the time between the Big Bang and the Epoch of Reionisation (EoR), when the Universe's lights switched on.”

 

https://www.sciencealert.com/murchison-widefield-array-lunar-occultation-milky-way-galaxy-radio-wave...

 

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Community Guru
Ravindra B Member Since: Sep 27, 2015
82 of 128

NASA has photographed more of those strangely soothing rectangular icebergs

 

“NASA scientists have captured images of an iceberg in Antarctica that looks perfectly rectangular.

 

“The photos were taken as part of Operation IceBridge, an ongoing NASA mission to document changes in polar ice. During a flight over the northern Antarctic Peninsula on October 16, scientists captured images of the rectangular iceberg while gathering information on changes in the ice heights of various glaciers in the area.”

 

https://www.sciencealert.com/nasa-s-photos-of-perfectly-rectangle-antarctica-iceberg-operation-icebr...

 

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Community Guru
John K Member Since: Feb 17, 2015
83 of 128

The US is hastening its own decline in AI, says a top Chinese investor

 

https://www.technologyreview.com/s/612224/the-us-is-hastening-its-own-decline-in-ai-says-a-top-chine...

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Community Guru
Ravindra B Member Since: Sep 27, 2015
84 of 128

Scientists have found the largest deep-sea nursery, with more than 1000 octopuses

 

“In the waters off the coast of California, marine scientists are finding a whole world of cephalopod wonders: in the latest instalment, it's a vast number of octopuses huddling over their eggs in the crevices of an extinct underwater volcano.”

 

https://www.sciencealert.com/octopus-nursery-davidson-seamount-california-1-000-octopuses-biggest-ev...

 

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Community Guru
Ravindra B Member Since: Sep 27, 2015
85 of 128

Experimental antibiotic gives new hope against superbugs in clinical trials

 

“An antibiotic with a whole new approach to conquering superbugs has shown promise in early clinical trials.

 

“Unlike other antibiotics currently on the market, the new drug, called cefiderocol, engages in a kind of biological subterfuge that overthrows Gram-negative bacteria from the inside out.”

 

https://www.sciencealert.com/trojan-horse-antibiotics-new-hope-resistant-superbugs-early-clinical-tr...

 

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Community Guru
Ravindra B Member Since: Sep 27, 2015
86 of 128

The truth about Americans trusting alternative cancer treatments is devastating

 

“Roughly 4 out of every 10 Americans believe that cancer can be cured through alternative remedies alone, according to a recent survey on views and opinions surrounding cancer and its treatment.”

 

https://www.sciencealert.com/results-of-the-2018-american-society-of-clinical-oncology-national-canc...

 

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Community Guru
John K Member Since: Feb 17, 2015
87 of 128

 A giant iceberg breaks off Antarctica

 

https://www.nationalgeographic.com/environment/2018/11/exclusive-first-pictures-of-iceberg-five-time...

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"No good deed goes unpunished." -- Clare Boothe Luce
Community Guru
Ravindra B Member Since: Sep 27, 2015
88 of 128

Astronomers found a black hole rotating so fast, it could be spinning space itself

 

“In fact, according to NASA this particular black hole is spinning very close to the limit set by Albert Einstein's theory of relativity, according to Rodrigo Nemmen, the lead author on the research paper. That means it is spinning close to the speed of light.

 

“Currently, scientists only have two ways of measuring black holes - either by their mass or by their spin rate. A spin rate can be anywhere between 0 and 1: this black hole was spinning at the rate of 0.9.

 

“Einstein's theory further implies that if a black hole is spinning that fast, then it is capable of making space itself rotate."

 

https://www.sciencealert.com/this-black-hole-could-be-rotating-space-itself-by-spinning-so-fast

 

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Community Guru
Reinier B Member Since: Nov 3, 2015
89 of 128

Meh. With a mass of only ten suns, not much space will spin along with the hole, if any space is actually spinning along with the hole,  considering that a black hole of this size is considerably smaller than the Sun.  

 

Now if it had the mass of a billion suns, and spun at 90% of c, we would have had something of real interest.  

Community Guru
Rene K Member Since: Jul 10, 2014
90 of 128

@Reinier B wrote:

Meh. With a mass of only ten suns, not much space will spin along with the hole, if any space is actually spinning along with the hole,  considering that a black hole of this size is considerably smaller than the Sun.  

 

Now if it had the mass of a billion suns, and spun at 90% of c, we would have had something of real interest.  


I haven't looked into this, but remember that the mass at rest of an object is not the whole story. There is way more energy in an object that has a strong momentum than the energy of its mass at rest. So I wouldn't be surprised if a spinning black hole had a strong friction effect on the space-time around it.

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