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The Latest: Takaaki Kajita, Arthur McDonald win 2015 Nobel prize in physics

  • This Sept. 2011 photo shows Takaaki Kajita of Japan, director of the Institute for Cosmic Ray Research and professor at the University of Tokyo, at the university's Institute for Cosmic Ray Research in Kashiwa, near Tokyo.  Kajita and Arthur McDonald of Canada won the Nobel Prize in physics on Tuesday, Oct. 6, 2015,  for the discovery of neutrino oscillations. (Kyodo News via AP) JAPAN OUT, CREDIT MANDATORY

    This Sept. 2011 photo shows Takaaki Kajita of Japan, director of the Institute for Cosmic Ray Research and professor at the University of Tokyo, at the university's Institute for Cosmic Ray Research in Kashiwa, near Tokyo. Kajita and Arthur McDonald of Canada won the Nobel Prize in physics on Tuesday, Oct. 6, 2015, for the discovery of neutrino oscillations. (Kyodo News via AP) JAPAN OUT, CREDIT MANDATORY  (The Associated Press)

  • Takaaki Kajita of Japan, director of the Institute for Cosmic Ray Research and professor at the University of Tokyo, speaks after learning he won the Nobel Prize in physics at the university in Tokyo, Tuesday, Oct. 6, 2015. Kajita and Arthur McDonald of Canada won the Nobel Prize in physics on Tuesday,  for the discovery of neutrino oscillations. (AP Photo/Eugene Hoshiko)

    Takaaki Kajita of Japan, director of the Institute for Cosmic Ray Research and professor at the University of Tokyo, speaks after learning he won the Nobel Prize in physics at the university in Tokyo, Tuesday, Oct. 6, 2015. Kajita and Arthur McDonald of Canada won the Nobel Prize in physics on Tuesday, for the discovery of neutrino oscillations. (AP Photo/Eugene Hoshiko)  (The Associated Press)

  • FILE - In this Nov. 29, 2006 file photo workers stand in front of a big spectrometer which is the heart of the tritium-neutrino- experiment at the research center of Karlruhe in Eggenstein-Leopoldshafen. (AP Photo/Winfried Rothermel, file)

    FILE - In this Nov. 29, 2006 file photo workers stand in front of a big spectrometer which is the heart of the tritium-neutrino- experiment at the research center of Karlruhe in Eggenstein-Leopoldshafen. (AP Photo/Winfried Rothermel, file)  (The Associated Press)

Latest developments in the announcements of the Nobel Prizes (all times local):

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11:55 a.m.

Takaaki Kajita and Arthur McDonald have won the 2015 Nobel Prize in physics.

The Royal Swedish Academy of Sciences cited the researchers "for the discovery of neutrino oscillations, which shows that neutrinos have mass."

Neutrinos are particles that whizz through the universe at nearly the speed of light.

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9:55 a.m.

The winner or winners of this year's Nobel Prize in physics are set to be announced at 0945 GMT by a committee at the Royal Swedish Academy of Sciences.

Since the Nobel Prizes were first handed out in 1901, 198 laureates have received the physics award. Only two were women.

American scientist John Bardeen is the only person to have won the physics award twice, in 1956 and 1972.

On Monday the 2015 Nobel Prize in medicine went to scientists from Japan, the U.S. and China who discovered drugs that are now used to fight malaria and other tropical diseases.

The prize announcements continue with chemistry on Wednesday, literature on Thursday, the Nobel Peace Prize on Friday and the economics award next Monday.