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STOCKHOLM — A Canadian-American cosmologist and two Swiss scientists won this year’s Nobel Prize in Physics on Tuesday for exploring the evolution of the universe and discovering a new kind of planet, with implications for that nagging question: Does life exist only on Earth?
“This year’s Nobel laureates in physics have painted a picture of the universe far stranger and more wonderful than we ever could have imagined,” said Ulf Danielsson of the Royal Swedish Academy of Sciences, which selected the laureates. “Our view of our place in the universe will never be the same again.”
Peebles, hailed as one of the most influential cosmologists of his time who realized the importance of the cosmic radiation background born of the Big Bang, will collect one half of the 9-million kronor ($918,000) cash award. Mayor, who is an astrophysicist, and Queloz, an astronomer who is also at the University of Cambridge in Britain, will share the other half.
The Nobel committee said Peebles’ theoretical framework about the cosmos — and its billions of galaxies and galaxy clusters — amounted to “the foundation of our modern understanding of the universe’s history, from the Big Bang to the present day.”

Starting a Revolution in Astronomy
His work, which began in the mid-1960s, set the stage for a “transformation” of cosmology over the last half-century, using theoretical tools and calculations that helped interpret traces from the infancy of the universe, the committee said.
A clearly delighted Peebles giggled repeatedly during a phone interview with The Associated Press, recalling how he answered a 5:30 a.m. phone call from Stockholm thinking that “it’s either something very wonderful or it’s something horrible.”
Peebles said he told his wife about the award, “And of course her reaction was, ‘Oh my God!'”
“I have a peaceful life,” he said. “It’s somehow now totally messed up!”
Mayor and Queloz were credited with having “started a revolution in astronomy” notably with the discovery of exoplanet 51 Pegasi B, a gaseous ball comparable with Jupiter, in 1995 — a time when, as Mayor recalled — that “no one knew whether exoplanets existed or not.”
“Prestigious astronomers had been searching for them for years, in vain!” Mayor quipped.
More Than 4,000 Exoplanets Have Since Been Found in the Milky Way Since Then
The committee said more than 4,000 exoplanets have since been found in the Milky Way since then.
“We now know that about a quarter of all stars have a planet of Earth’s size and surface temperature, with the potential of hosting liquid water and the chemistry of life on its surface,” he said.
Queloz was meeting with other academics interested in finding new planets when the press office at Cambridge University interrupted to tell him the big news: He had won the Nobel. He thought it was joke at first.
“I could barely breathe,” Queloz told the AP. “It’s enormous. It’s beyond usual emotions. My hand was shaking for a long time. I’m trying to digest it.”
Swedish academy member Mats Larsson said this year’s was “one of the easiest physics prizes for a long time to explain.”
“If there are a hundred billion planetary systems, with maybe 10 billion planetary systems with Earth-like planets, it would be highly unlikely and against all physical theories to assume that life only developed on our planet,” he added.

This Was the 113th Nobel Prize in Physics Awarded Since 1901
The cash prize comes with a gold medal and a diploma that are received at an elegant ceremony in Stockholm on Dec. 10, the anniversary of the death of prize founder Alfred Nobel in 1896, together with five other Nobel winners. The sixth one, the peace prize, is handed out in Oslo, Norway on the same day.
This was the 113th Nobel Prize in Physics awarded since 1901, of which 47 awards have been given to a single laureate. Only three women have been awarded it so far: Marie Curie in 1903, Maria Goeppert-Mayer in 1963 and Donna Strickland in 2018, according to the Nobel website.
On Monday, Americans William G. Kaelin Jr. and Gregg L. Semenza and Britain’s Peter J. Ratcliffe won the Nobel prize for Physiology or Medicine, for discovering details of how the body’s cells sense and react to low oxygen levels, providing a foothold for developing new treatments for anemia, cancer and other diseases.
Nobel, a Swedish industrialist and the inventor of dynamite, decided the physics, chemistry, medicine and literature prizes should be awarded in Stockholm, and the peace prize in Oslo.
The Nobel Prize for Chemistry will be announced Wednesday, two Literature Prizes will be awarded on Thursday, and the Peace Prize comes Friday. This year will see two literature Prizes handed out because the one last year was suspended after a scandal rocked the Swedish Academy.
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