Newspaper article International New York Times

Sea of Water Is Discovered under Ice on Saturn Moon

Newspaper article International New York Times

Sea of Water Is Discovered under Ice on Saturn Moon

Article excerpt

The findings confirm what scientists have suspected about the moon, Enceladus, ever since they were astonished in 2005 by photographs showing geysers of ice crystals shooting out of its south pole.

Inside a moon of Saturn, beneath its icy veneer and above its rocky core, is a sea of water the size of Lake Superior, scientists announced on Thursday.

The findings, published in the journal Science, confirm what planetary scientists have suspected about the moon, Enceladus, ever since they were astonished in 2005 by photographs showing geysers of ice crystals shooting out of its south pole.

"What we've done is put forth a strong case for an ocean," said David J. Stevenson, a professor of planetary science at the California Institute of Technology and an author of the Science paper.

For many researchers, this tiny, shiny cueball of a moon, just over 300 miles wide, is now the most promising place to look for life elsewhere in the solar system, even more than Mars.

"Definitely Enceladus," said Larry W. Esposito, a professor of astrophysical and planetary sciences, who was not involved in the research. "Because there's warm water right there now."

Enceladus is caught in a gravitational tug of war between Saturn and another moon, Dione, which bends its icy outer layer, creating friction and heat. In the years since discovering the geysers, the NASA spacecraft Cassini has made repeated flybys of Enceladus, photographing the fissures (nicknamed tiger stripes) where the geysers originate, measuring temperatures and identifying carbon- based organic molecules that could serve as building blocks for life.

Cassini has no instruments that can directly detect water beneath the surface, but three flybys in the years 2010-12 were devoted to producing a map of the gravity field, noting where the pull was stronger or weaker. During the flybys, lasting just a few minutes, radio telescopes that are part of the Deep Space Network broadcast a signal to the spacecraft, which echoed it back to Earth. …

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