A pleasant surprise from Saturn’s moon

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Geyser-like eruptions of ice particles and water vapour from Saturn’s moon Enceladus.
Geyser-like eruptions of ice particles and water vapour from Saturn’s moon Enceladus.

WASHINGTON: Astronomers looking at the spectacular supersonic plumes of gas and dust shooting off one of Saturn’s moons have said there are strong hints of liquid water, a key building block of life.

Their research, appearing in Thursday’s issue of the journal Nature, adds to the growing push to explore further the moon Enceladus, as one of the solar system’s most compelling places for potential life.

Using images from the National Aeronautics and Space Administration’s (NASA) Cassini probe, astronomers had already figured that the mysterious plumes shooting from Enceladus’ icy terrain contain water vapour.

New calculations suggesting the gas and dust spew at speeds faster-than-sound make the case for liquid, said study lead author Candice Hansen of NASA’s Jet Propulsion Laboratory in California.

Her team calculated that the plumes travel more than 2,176 kmph. Reaching that speed “is hard to do without liquids,” Ms. Hansen said.

Not final proof

While her research paper offers more evidence building on what others have found, she added that her research is not the final proof of liquid water on Enceladus (pronounced en-SELL-ah-dus).

Other planetary scientists, such as Andrew Ingersoll at the California Institute of Technology, said the research is good, but that it is possible to achieve such speeds with ice particles and at cooler temperatures. So Ms. Hansen has not proven her case yet, he and other scientists said.

Carolyn Porco, the head of the Cassini camera team and an astronomer who did not take part in Ms. Hansen’s research, said “the evidence in my mind is building on liquid water.”

That moon, one of 60 circling Saturn, “has become the go-to place” for exploration in the outer planets, she said.

Europa, a moon of Jupiter, may have a liquid ocean beneath its frozen surface. But Enceladus, thought to be responsible for producing one of Saturn’s rings, is considered more accessible, Ms. Hansen said. — AP

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