Researchers Saul Perlmutter and Adam Riess of the United States and US-Australian Brian Schmidt won the 2011 Nobel Physics Prize on Tuesday for their research on supernovae, the Nobel jury said.
"They have studied several dozen exploding stars, called supernovae, and discovered that the universe is expanding at an ever-accelerating rate," it said, adding that their discovery had changed mankind's understanding of the universe.
The award went to observations of ancient stars that flare in their death throes into becoming supernovae.
By looking at a certain type of supernova, the astronomers discovered a benchmark for the movement of light.
Their work confirms a theory first proposed by Albert Einstein, which he dubbed the cosmological constant.
The prizewinning breakthrough came in 1998, when one research team headed by Perlmutter and another led by Schmidt and accompanied by Riess reached the same astounding conclusion that the expansion of the universe was rapidly accelerating
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