This is an edited version of Martin Cassini's Four Thought talk for BBC Radio 4.
The Cassini-Huygens mission is a cooperative project between Nasa, Esa and the Italian Space Agency (Asi).
In the extended mission, Cassini could come as close as 24km (15 miles) from the moon's surface.
They are busy flying the Cassini spacecraft around Saturn and building the next generation of Mars Rovers.
In some of the most breathtaking pictures from Cassini we can actually watch the moons at work.
The data from the Cassini spacecraft is said to strengthen the idea that Enceladus harbours a sub-surface sea.
Carl Murray, from Queen Mary, University of London, is one of the senior British astronomers on the Cassini mission.
Europe has no expertise with RTGs - the Americans have, and Cassini carries three to provide 700 watts to its systems.
BBC: NEWS | Science/Nature | Europe tells US: 'Come to Europa'
Images taken by the Cassini spacecraft provide bird's-eye views of the terrain, with no details about a landform's elevation or depth.
Scientists observing Saturn's moon Titan with NASA's Cassini spacecraft have boldly gone where no man has gone before -- visually, anyway.
Nasa said three of the science instruments on Cassini were suffering from minor ailments, but the impact on data gathering was minimal.
Cassini scientists are meeting in London this week ahead of a major conference of the American Astronomy Society in Cambridge next week.
BBC: NEWS | Science/Nature | Saturn moon delights and baffles
Certainly, what the Cassini data has done is thrust Enceladus up the interest index of objects in the Solar System that demand further investigation.
BBC: NEWS | Science/Nature | Saturn moon delights and baffles
Cassini-Huygens was launched on 15 October 1997, from Cape Canaveral, Florida, taking seven years to make the 3.5 billion km (2.2 billion miles) journey to Saturn.
After orbiting the ringed planet for nine years, NASA's Cassini probe has managed to snag video of a super storm on the celestial body's north pole.
This is a plutonium-driven device that produces power far more efficiently than the traditional Radioisotope Thermoelectric Generators (RTGs) used hitherto on space missions, such as on Cassini.
In 1673 it was a shocker when Gian Domenico Cassini first measured the distance to the sun at 87 million miles (darn close to the modern measurement, 93 million miles).
Using radar imagery collected from nine years of Cassini flybys, researchers were able to patch together the first global topographic map of Titan, published in the July 2013 issue of Icarus.
"Bit by bit, we're accumulating the evidence that there is liquid water on Enceladus, " said Carolyn Porco, team leader of the Cassini imaging group and one of the senior scientists on the mission.
For the show, each planet has a unique video that employs analog and digital processes: charcoal animation for Mercury, volumetric pigments in water for Jupiter, thousands of images from the NASA Cassini mission for Saturn.
Images sent back from the Cassini spacecraft (which has been in orbit around Saturn since 2004) have revealed how the fine structure of the rings is broken up into intricate patterns of thousands of ringlets and gaps.
"One of the most fascinating aspects of Enceladus is that it's so very small as icy moons go, but so very geophysically active, " said Dr Bob Brown, from the University of Arizona, US, and team leader for Cassini's visual and infrared mapping spectrometer.
BBC: NEWS | Science/Nature | Saturn moon delights and baffles
But, she says, it is still unclear if liquid on the surface of Titan is in the form of puddles, lakes or oceans although the arrival of a spacecraft called Cassini in 2004 might solve the mystery when it drops a probe into Titan's atmosphere.
"We have never explored such a place beyond our own Earth, and the technology required is not too different from the successful US-European Cassini-Huygens mission, so it's a natural for the next big international collaboration in space, " commented the scientist, who worked on the 1990s Galileo mission to Jupiter.
BBC: NEWS | Science/Nature | Europe tells US: 'Come to Europa'
Other activities for Cassini scientists during the extended mission will include monitoring seasons on Titan and Saturn, observing unique ring events - such as the 2009 equinox when the Sun will be in the plane of the rings - and exploring new places within Saturn's magnetic "envelope" - or magnetosphere.
"It's quite likely that this moon will now join the ranks of Mars and Jupiter's moon Europa where you might have liquid water - and the biologists could start getting interested in this being a place were life might possibly arise, " enthused Dr Torrence Johnson, a Cassini scientist from Nasa's Jet Propulsion Laboratory in California.
BBC: NEWS | Science/Nature | Saturn moon delights and baffles
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