Telstra has revealed the addition of almost one million new mobile services in the six months to December 2011, but Sensis revenues plummeted 24 percent in 12 months.
Carolyn Proco, of the Cassini imaging team (Space Science Institute at Boulder, Colorado), states, "Of all the geologic provinces in the Saturn system that Cassini has explored, none has been more thrilling or carries greater implications than the region at the southernmost portion of Enceladus.”
Helfenstein, another Cassini imaging team member, states, "Enceladus has Earth-like spreading of the icy crust, but with an exotic difference -- the spreading is almost all in one direction, like a conveyor belt. Asymmetric spreading like this is unusual on Earth and not well understood."
Helfenstein added, "Enceladus has asymmetric spreading on steroids. We are not certain about the geological mechanisms that control the spreading, but we see patterns of divergence and mountain-building similar to what we see on Earth, which suggests that subsurface heat and convection are involved."
NASA states, “Images from recent close flybys also have bolstered an idea the Cassini imaging team has that condensation from the jets erupting from the surface may create ice plugs that close off old vents and force new vents to open."
And, "The opening and clogging of vents also corresponds with measurements indicating the plume varies from month to month and year to year.”
Porco explains, "We see no obvious distinguishing markings on the surface in the immediate vicinity of each jet source, which suggests that the vents may open and close and thus migrate up and down the fractures over time. Over time, the particles that rain down onto the surface from the jets may form a continuous blanket of snow along a fracture."
The Cassini scientific team conjecture that the excess heat emerging from the south polar region of Enceladus, along with plenty of water vapor and organic compounds, could hold a habitable zone for microscopic life beneath the moon’s south pole.
We'll know more as Cassini continues its investigation of Saturn and its moons.
David Bass
| For the fourth year in a row, IDC has placed content security provider Websense (NASDAQ: WBSN) at the top of the IDC Worldwide Web Security 2011 –…
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