Adam Riess, US astrophysicist

Adam Riess, US astrophysicist

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Credit: EMILIO SEGRE VISUAL ARCHIVES/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: Adam Riess (b. 1969), US astrophysicist. Riess is best known for his work on the rate of acceleration of the universe. Riess used the Hubble Space Telescope to study the most distant type Ia supernovae. The amount of light that can be detected from these supernovae gives their distance. Small shifts in this light give the speed at which they are moving away from the observer. Unexpectedly the supernovae, and therefore the universe, were shown to be accelerating outwards. Reiss was awarded the 2011 Nobel Prize in Physics for this discovery along with his colleague Brian Schmidt, and Saul Perlmutter who made the same discovery independently.

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