Nobel Prize in Physics goes to gravitational wave scientists

The Nobel Prize in Physics has been awarded to three scientists for their roles in detecting faint ripples flying through the universe gravitational waves predicted a century ago by AlbertEinstein that provide a new understanding of the universe.

Sweden's Royal Academy of Sciences announced Tuesday the winners are Rainer Weiss of the Massachusetts Institute of Technology,and Barry Barish and Kip Thorne of the California Institute of Technology.

The three were key to the first observation of gravitational waves in September 2015.

When the discovery was announced several months later, it was a sensation not only among scientists but also the general public.

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The scientists were honoured for a combination of highly advanced theory and ingenious equipment design.

"It's a win for the human race as a whole. These gravitationalwaves will be powerful ways for the human race to explore theuniverse," said Thorne, speaking by phone with The Associated Pressfrom California shortly after the announcement.

Ariel Goobar, of the Royal Academy, said thewinners' work meant we can study processes thatwere "completely impossible, out of reach to us in the past."

"The best comparison is when Galileo discovered the telescope,which allowed us to see that Jupiter had moons, and all of a sudden we discovered that the universe was much vaster than we used tothink about," Goobar said.

With the technology that the three developed "We may even seeentirely new objects that we haven't even imagined yet," said Patrick Sutton, an astronomer at Cardiff University in Wales.

'The work of a thousand people'

Weiss, in a phone call with the news conference at the Royal Swedish Academy of Sciences, said: "I view this more as a thing that recognizes the work of a thousand people."

He said researchers hope to one day improve the sensitivity of their detectors to look "deeper and deeper" into the universe.

Gravitational waves are extremely faint ripples in the fabric of space and time, generated by some of the most violent events in the universe.

The waves detected by the laureates came from the collision of two black holes some 1.3 billion light-years away. A light-year is about 5.88 trillion miles.

The waves were predicted by Albert Einstein a century ago as part of his theory of general relativity. General relativity says that gravity is caused by heavy objects bending space-time, which itself is the four-dimensional way that astronomers see the universe.

The prize is "a win for Einstein and a very big one," Barish told the AP.

The German-born Weiss was awarded half of the 9-million kronor ($1.3-million Cdn) prize amount, and Thorne and Barish will split the other half.

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In the 1970s, Weiss designed a laser-based device that woulddetect gravitational waves. He, Thorne and Barish "ensured that four decades of effort led to gravitational waves finally beingobserved," the Nobel announcement said.

The laser device, called an interferometer, must be bothexquisitely precise and extremely stable. "The beam must hit themirrors precisely. They should hardly shake at all, not even whenleaves fall from nearby trees," according to a prize backgroundpaper.

The first detection of gravity waves involved two of the devicesabout 3,000 kilometresapart in Hanford, Washington,
and Livingston, Louisiana. The wave first passed the Livingstonfacility and, sevenmilliseconds later, at Hanford, consistent with thespeed of light.

The announcement said Einstein was convinced that gravitationalwaves could never be measured. The laureates used laser devices "tomeasure a change thousands of times smaller than an atomicnucleus."

In a moment of poetry aimed at making the distant and infinitesimal phenomenon understandable to non-experts, the academy announcement said gravitational waves "are always created when a mass accelerates, like when an ice-skater pirouettes or a pair of black holes rotate around each other."

For the past 25 years, the physics prize has been shared among multiple winners.

The 2016 awardwent to three British-born researchers who applied the mathematical discipline of topology to help understand the workings of exotic matter such as superconductors and superfluids. In 2015, a Japanese and a Canadian shared the physics prize for studies that proved that the elementary particles called neutrinos have mass.

This year's awards were launched Monday, with the Nobel Prize in Medicine going to three Americans (Jeffrey C.Hall, Michael Rosbash and Michael W. Young) studying circadian rhythms better known as body clocks.

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