Peebles, Phillip James Edwin

Peebles, Phillip James Edwin,

1935–, Canadian-American astrophysicist and cosmologist, b. Winnipeg, Man., Ph.D. Princeton, 1962. He spent his entire career as a researcher at Princeton, becoming a full professor in 1972 (emeritus from 2000). Peebles received half of the 2019 Nobel Prize in Physics for his theoretical discoveries in physical cosmology; Michel MayorMayor, Michel Gustave Edward,
1942–, Swiss astrophysicist, Ph.D. Univ. of Geneva, 1971. He spent his entire career at the Univ. of Geneva, retiring as professor emeritus in 2007.
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 and Didier QuelozQueloz, Didier Patrick,
1966–, Swiss astronomer, Ph.D. Univ. of Geneva, 1995. He has been a member of the faculty at the Univ. of Geneva since 2003 (professor from 2008) and since 2013 also has been a professor at Cambridge.
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 were awarded the other half for their discovery of an exoplanet orbiting a sunlike star. Peebles established a mathematical foundation for the field of cosmology, and his theories have helped elucidate almost 14 million years of cosmological history, explaining how complex structures like galaxies developed and helping to establish that dark matterdark matter,
material that is believed to make up nearly 27% of the mass of the universe but is not readily visible because it neither emits nor reflects electromagnetic radiation, such as light or radio signals.
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 and dark energydark energy,
repulsive force that opposes the self-attraction of matter (see gravitation) and causes the expansion of the universe to accelerate. The search for dark energy was triggered by the discovery (1998) in images from the Hubble Space Telescope of a distant supernova
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 are the primary components of the universe.
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