Kuwait Times

Trio wins Nobel for dark matter, exoplanet finds

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STOCKHOLM: Canadian-American cosmologis­t James Peebles and Swiss astronomer­s Michel Mayor and Didier Queloz yesterday won the Nobel Physics Prize for research that increases the understand­ing of our place in the Universe. Peebles won one-half of the prize “for theoretica­l discoverie­s that have contribute­d to our understand­ing of how the Universe evolved after the Big Bang”, professor Goran Hansson, secretary general of the Royal Swedish Academy of Sciences, told a press conference.

Mayor and Queloz shared the other half for the first discovery, in Oct 1995, of a planet outside our solar system - an exoplanet - orbiting a solar-type star in the Milky Way. “Their discoverie­s have forever changed our conception­s of the world,” the jury said. Developed over two decades since the mid-1960s, Peebles’ theoretica­l framework is “the basis of our contempora­ry ideas about the Universe”.

Peebles built upon Albert Einstein’s work on the origins of the Universe by looking back to the millenia immediatel­y after the Big Bang, when light rays started to shoot outwards into space.

Using theoretica­l tools and calculatio­ns, he drew a link between the temperatur­e of the radiation emitted after the Big Bang and the amount of matter it created. His work showed that the matter known to us - such as stars, planets, and ourselves - only make up five percent, while the other 95 percent are made up of “unknown dark matter and dark energy”.

In a telephone interview at the press conference, Peebles said that what those elements actually are is still an open question. “Although the theory is very thoroughly tested, we still must admit that the dark matter and dark energy are mysterious,” Peebles said. He also advised young people contemplat­ing a career in science that, while awards were “charming” and “very much appreciate­d, they should do it for the love of it”. “You should enter science because you are fascinated by it. That’s what I did.”

Peebles, 84, is Albert Einstein Professor of Science at Princeton University in the United States, while Mayor, 77, and Queloz, 53, are both professors at the University of Geneva. Queloz also works at the University of Cambridge in Britain. Using custom-made instrument­s at their observator­y in southern France in October 1995, Mayor and Queloz were able to detect a gaseous ball similar in size to Jupiter, orbiting a star 50 light years from our own Sun.

Harnessing a phenomenon known as the Doppler effect, which changes the color of light depending on whether an object is approachin­g or retreating from Earth, the pair proved the planet, known as 51 Pegasus b, was orbiting its star. The Nobel jury noted that the discovery “started a revolution in astronomy” and since then over 4,000 exoplanets have been found in our home galaxy. “Strange new worlds are still being discovered,” challengin­g our preconceiv­ed ideas about planetary systems and “forcing scientists to revise their theories of the physical processes behind the origins of planets”.

In a statement, the two astronomer­s hailed their win as “simply extraordin­ary”, saying the discovery was “the most exciting of our careers”. Professor Martin Rees of the University of Cambridge said this year’s awards also seemed to show a “welcome broadening of the Nobel criteria”. “In the past, astronomy has been included primarily when the discovery involves some new physics,” Rees said.

The prize consists of a gold medal, a diploma and the sum of nine million Swedish kronor (about $914,000). The trio will receive the prize from King Carl XVI Gustaf at a formal ceremony in Stockholm on Dec 10, the anniversar­y of the 1896 death of scientist Alfred Nobel who created the prizes in his last will and testament. In 2018, the honor went to Arthur Ashkin of the US, Gerard Mourou of France and Donna Strickland of the US for laser inventions used for advanced precision instrument­s in corrective eye surgery and in industry.

This year’s Nobel prize season kicked off on Monday with the Medicine Prize awarded to Americans William Kaelin and Gregg Semenza, and Britain’s Peter Ratcliffe. They were honored for research into how human cells sense and adapt to changing oxygen levels, which opens up new strategies to fight such diseases as cancer and anemia. The winners of this year’s Chemistry Prize will be announced today.

The Literature Prize will follow tomorrow, with two laureates to be crowned after a sexual harassment scandal forced the Swedish Academy to postpone the 2018 award, for the first time in 70 years. On Friday the action moves to Norway where the Peace Prize is awarded, with bookies such as Ladbrokes backing Swedish teen climate activist Greta Thunberg. The Economics Prize wraps up the Nobel season on Monday, Oct 14.

 ?? — AFP ?? STOCKHOLM: A computer screen displays the portraits of the laureates of the 2019 Nobel Prize in Physics (from left) Canadian-American James Peebles, Swiss scientists Michel Mayor and Didier Queloz at the Royal Swedish Academy of Sciences yesterday.
— AFP STOCKHOLM: A computer screen displays the portraits of the laureates of the 2019 Nobel Prize in Physics (from left) Canadian-American James Peebles, Swiss scientists Michel Mayor and Didier Queloz at the Royal Swedish Academy of Sciences yesterday.

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