Stars formed early on in universe, theory says

Associated Press

WASHINGTON — Half a billion years of utter blackness following the Big Bang, the theoretical start of the universe, was broken by an explosion of stars bursting into life like a fireworks finale across the heavens, a new theory suggests.

An analysis of very faint galaxies in the deepest view of the universe ever captured by a telescope suggests there was an eruption of stars bursting to life and piercing the blackness very early in the 15 billion-year history of the universe.

The study, by Kenneth Lanzetta of the State University of New York at Stony Brook, challenges the long-held belief that star formation started slowly after the Big Bang and didn’t peak until some 5 billion years later.

"Star formation took place early and very rapidly," Lanzetta said Tuesday at a NASA news conference. "Star formation was 10 times higher in the distant early universe than it is today."

Lanzetta’s conclusions are based on an analysis of a deep field study by the Hubble Space Telescope. To capture the faintest and most distant images possible, the Hubble focused on an ordinary bit of sky for more than 14 days, taking a picture of every object within a small, deep slice of the heavens. The resulting images are faint, fuzzy bits of light from galaxies near and far, including some more than 14 billion light years away, Lanzetta said.

The surprise was that the farther back the telescope looked, the greater the star-forming activity.

"Star formation continued to increase to the very earliest point that we could see," Lanzetta said. "We are seeing close to the first burst of star formation."

Bruce Margon of the Space Telescope Science Institute in Baltimore said Lanzetta’s conclusions are a "surprising result" that will need to be confirmed by other studies.

"This suggests that the great burst of star formation was at the beginning of the universe," said Margon, noting that, in effect, "The finale came first."

"If this can be verified, it will dramatically change our understanding of the universe," said Anne Kinney, director of the astronomy and physics division at NASA.

In his study, Lanzetta examined light captured in the Hubble deep-field images using up to 12 different light filters to separate the colors. The intensity of red was used to establish the distance to each point of light. The distances were then used to create a three-dimensional perspective of the 5,000 galaxies in the Hubble picture.

Lanzetta also used images of nearby star fields as a yardstick for stellar density and intensity to conclude that about 90 percent of the light in the very early universe was not detected by the Hubble. When this missing light was factored into the three-dimensional perspective, it showed that the peak of star formation came just 500 million years after the Big Bang and has been declining ever since.

Lisa Storrie-Lombardi, a California Institute of Technology astronomer, said the colors of the galaxies in the Hubble deep-field images "are a very good indication of their distance."

Current theory suggests that about 15 billion years ago an infinitely dense single point exploded — the Big Bang — creating space, time, matter and extreme heat. As the universe cooled, light elements such as hydrogen and helium formed.

Later, some of areas became more dense with elements than others, forming gravitational centers that attracted more and more matter. Eventually, forming celestial bodies became dense enough to start nuclear fires, setting the heavens aglow. These were newborn stars.

Copyright ©2002 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

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