Titan's Volcanoes Give NASA Spacecraft Chilly Reception
PASADENA, Calif. - Data collected during several recent flybys of Titan by NASA's Cassini spacecraft
have put another arrow in the quiver of scientists who think the Saturnian moon contains active
cryovolcanoes spewing a super-chilled liquid into its atmosphere. The information was released
today during a meeting of the American Geophysical Union in San Francisco, Calif.
"Cryovolcanoes are some of the most intriguing features in the solar system," said Rosaly Lopes,
a Cassini radar team investigation scientist from NASA's Jet Propulsion Laboratory in Pasadena,
Calif. "To put them in perspective -- if Mount Vesuvius had been a cryovolcano, its lava would
have frozen the residents of Pompeii."
Rather than erupting molten rock, it is theorized that the cryovolcanoes of Titan would erupt
volatiles such as water, ammonia and methane. Scientists have suspected cryovolcanoes might inhabit
Titan, and the Cassini mission has collected data on several previous passes of the moon that suggest
their existence. Imagery of the moon has included a suspect haze hovering over flow-like surface formations.
Scientists point to these as signs of cryovolcanism there.
"Cassini data have raised the possibility that Titan's surface is active," said Jonathan Lunine, a Cassini
interdisciplinary scientist from the Lunar and Planetary Laboratory, University of Arizona, Tucson. "This
is based on evidence that changes have occurred on the surface of Titan, between flybys of Cassini, in regions
where radar images suggest a kind of volcanism has taken place."
What led some Cassini scientists to believe that things are happening now were changes in brightness and
reflectance detected at two separate and distinct regions of Titan. Reflectance is the ratio of light that
radiates onto a surface to the amount reflected back. These changes were documented by Visible and Infrared
Mapping Spectrometer data collected on Titan flybys from July 2004 to March 2006. In one of the two regions,
the reflectance of the surface surged upward and remained higher than expected. In the other region, the reflectance
shot up but then trended downward. There is also evidence that ammonia frost is present at one of the two changing
sites. The ammonia was evident only at times when the region was inferred to be active.
"Ammonia is widely believed to be present only beneath the surface of Titan," said Robert M. Nelson of JPL, a
scientist for Cassini's Visual and Infrared Mapping Spectrometer team. "The fact that we found it appearing at
times when the surface brightened strongly suggests that material was being transported from Titan's interior
to its surface."
Some Cassini scientists indicate that such volcanism could release methane from Titan's interior, which explains
Titan's seemingly continuous supply of fresh methane. Without replenishment, scientists say, Titan's original
atmospheric methane should have been exhausted long ago.
But other scientists familiar with the spectrometer data argue that the ammonia identification is not certain,
and that the purported brightness changes might not be associated with changes on Titan's surface. Instead they
might result from the transient appearances of ground "fogs" of ethane droplets very near Titan's surface,
driven by atmospheric rather than geophysical processes. Nelson has considered the ground fog option, stating,
"There remains the possibility that the effect is caused by a local fog, but if so, we would expect it to change
in size over time due to wind activity, which is not what we see."
The chilly volcanoes of Titan are not a fait accompli. An alternative hypothesis to an active Titan suggests the
Saturnian moon could be taking its landform evolution cues from a moon of Jupiter.
"Like Callisto, Titan may have formed as a relatively cold body, and may have never undergone enough tidal
heating for volcanism to occur," said Jeffrey Moore, a planetary geologist at the NASA Ames Research Center,
Moffett Field, Calif. "The flow-like features we see on the surface may just be icy debris that has been lubricated
by methane rain and transported downslope into sinuous piles like mudflows."
More revelations may be forthcoming. Scientists are still analyzing the data from Cassini's most recent flyby on
Dec. 5. Cassini's next Titan flyby is scheduled in 11 days, when the spacecraft will come within 970 kilometers
(603 miles) of its cloud-shrouded surface.
For more information about the Cassini-Huygens mission, visit: http://saturn.jpl.nasa.gov
The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency.
JPL, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission
Directorate in Washington, D.C. The Cassini orbiter was designed, developed and assembled at JPL. The radar
instrument was built by JPL and the Italian Space Agency, working with team members from the United States
and several European countries. The Visual and Infrared Mapping Spectrometer team is based at the University of Arizona.
Jet Propulsion Laboratory, Pasadena, Calif.
Rachel Prucey 650-604-0643
NASA Ames Research Center, Moffett Field, Calif.