- Associated Press - Tuesday, October 4, 2011

WASHINGTON (AP) - A Johns Hopkins University professor was one of a trio of scientists awarded the 2011 Nobel Prize in physics Tuesday for discovering that the universe is expanding at a faster and faster rate, contrary to science’s conventional wisdom.

The Royal Swedish Academy of Sciences announced that Adam Riess, an astronomy and physics professor at the university, won the prize with fellow American Saul Perlmutter and U.S.-Australian citizen Brian Schmidt. Perlmutter heads the Supernova Cosmology Project at the University of California, Berkeley. Schmidt is the head of the High-z Supernova Search Team at the Australian National University in Weston Creek, Australia

The trio was honored “for the discovery of the accelerating expansion of the universe through observations of distant supernovae.”

Riess, 41, said he got a phone call around 5:30 a.m. Several Swedish men were on the line, at which point he “knew it wasn’t Ikea,” the Swedish furniture retailer. His “jaw dropped” when he heard the news, he said.

“I’m dazed,” he said in a telephone interview, adding that he couldn’t believe he had won.

The work Riess is being honored for stems from a 1998 discovery that the rate at which the universe is expanding is speeding up, a discovery Riess called “truly startling.”

The discovery contradicted conventional scientific wisdom that the universe’s expansion would be slowing down as a result of what Riess calls the “gravitational glue” of the rest of the universe. The work led to the discovery of what’s called dark energy, which is believed to be responsible for the universe’s accelerating expansion, though researchers still don’t know much about it.

Riess, who has an undergraduate degree in physics MIT and a doctorate in astrophysics from Harvard, said he spends the last two classes of his introductory astronomy course at Johns Hopkins talking about the discovery. He tells students in his “Stars and the Universe” class that they are fortunate to have such an “exciting mystery” to help solve.

“I sort of turn to them at that point and say I hope many of you continue on in this field and help us understand this mystery,” he said.

Riess said that as a child he loved science and wanted to study dinosaurs. He didn’t use a telescope until graduate school, he said. He says he finds looking through a telescope awe inspiring.

“Most of it’s a mystery,” he said of looking out at the universe. “If we very carefully study this ancient tired light we can get some clues as to what really is the universe.”