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Home Headline

Black hole discoveries win 2020 Nobel Prize for Physics

Georgia Asian Times by Georgia Asian Times
October 6, 2020
in Headline, Lifestyle
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Stockholm-Berlin, Oct 6, 2020 – Britain’s Roger Penrose, Reinhard Genzel of Germany and American Andrea Ghez won the 2020 Nobel Prize for Physics on Tuesday for their discoveries about one of the most exotic phenomena in the universe, the black hole.

Penrose, professor at the University of Oxford, won half the prize of 10 million Swedish crowns ($1.1 million) for his work using mathematics to prove that black holes are a direct consequence of Albert Einstein’s general theory of relativity.

Genzel, of the Max Planck Institute and University of California, Berkeley, and Ghez, at the University of California, Los Angeles, shared the other half for discovering that an invisible and extremely heavy object governs the orbits of stars at the centre of our galaxy.

Ghez – only the fourth woman to be awarded the Physics prize after Marie Curie in 1903, Maria Goeppert-Mayer in 1963 and Donna Strickland in 2018 – said she hoped it would inspire others.

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Asked about the discovery of a massive yet invisible object at the heart of the Milky Way, Ghez said “the first thing is doubt”.

“You have to prove to yourself that what you are really seeing is what you think you are seeing. So, both doubt and excitement,” the 55-year-old astronomer said in a call with the committee after receiving the award.

“It’s that feeling of being at the frontier of research when you have to always question what you are seeing.”

Genzel, 68, told Reuters Television soon after hearing he had shared the prize that had been on a Zoom call with colleagues when the phone rang.

“Just like in the movies, a voice said: ‘This is Stockholm’,” he said. He admitted to being flabbergasted by the news: “I cried a little bit.”

 

WHERE TIME ENDS

Scientists have wondered since the 18th century whether any object existed in the universe that would exert a gravitational pull so strong that light may not be able to escape.

Einstein predicted in 1915, in his general theory of relativity, that space and time could be warped by the force of gravity. Yet he did not actually believe in black holes, and finding a way to prove their existence baffled scientists for another 50 years.

“It was a theory – there was nothing to make black holes visible,” said Genzel.

It was not until a seminal paper in 1965 that Penrose, now 89, proved that black holes can really form – describing them in detail and stating that, at their centre, time and space cease to exist.

Illustrating Penrose’s insight at the awards presentation in Stockholm, Ulf Danielsson of the Nobel Committee held a black ball the size of a grapefruit in one hand and pointed at it with the finger of his other hand.

At the ball’s edge, time stands still, Danielsson said, and as his finger pushed into it, its tip moves into the future.

It would be impossible to withdraw one’s finger without tearing it apart. Instead it would be “carried all the way into the centre of the black hole, where time ends and the known laws of physics cease to apply”.

 

‘AWE-INSPIRING’ MYSTERY

Subsequent efforts to find a black hole focused on the clouds of dust in a region of the Milky Way called Sagittarius A*. By observing movements of stars, teams of astronomers led by Genzel and Ghez concluded that around 4 million solar masses are packed into a region the size of our solar system.

“Penrose, Genzel and Ghez together showed us that black holes are awe-inspiring, mathematically sublime, and actually exist,” said Tom McLeish, professor of natural philosophy at Britain’s University of York.

While black holes are now accepted science, much about them remains a mystery.

“What is the black hole? We don’t know, we have no idea what is inside a black hole and that is what makes these things such exotic objects,” said Ghez.

Physics is the second of this year’s crop of Nobels to be awarded, after three scientists won the medicine prize for their discovery of Hepatitis C on Monday.

The Nobel prizes were created in the will of Swedish dynamite inventor and businessman Alfred Nobel and have been awarded since 1901.

This year’s awards are taking place under the long shadow of the COVID-19 pandemic that has curtailed much of the usual festivities surrounding the prizes. ($1 = 8.9108 Swedish crowns) – Reuters

 

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