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If the question is life - and that's one of the most profound questions we can ask, he says - the answer is almost certainly not Mars or an asteroid, but rather the icy moons orbiting distant planets like Saturn and Jupiter.
BBC: Is Nasa looking in the wrong place for life?
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"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
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Since being demoted from planet to dwarf planet in 2006 we've actually discovered two new moons orbiting the icy sun satellite.
ENGADGET: Alt-week 7.28.12: social mathematics, Pluto's moons and humans-on-a-chip
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Galileo, which has spent the past two years studying Jupiter and its four largest moons, will now concentrate on Europa's icy crust.
CNN: Galileo moves on to Europa