The Cassini Mission and Astrobiology

In Boulder, Colorado, many NASA representatives have been meeting up to discuss a program maintained by SETI called NASA's Astrobiology Institute (NAI). In this meeting they discussed how important it is for researchers to stick with terrestrial worlds, because, although there may be other ways for life to start, the only way scientists currently know of is terrestrial derived. The three planets these scientists plan to look at are: Mars, which is said to clearly have water on its surface at one time; Jupiter’s moon Europa, which is said to have a massive ocean underneath it's icy surface which is likely to harbor life; and lastly, Saturn's moon Titan, which is said to be most mysterious out of the three planets, but shows signs of being a terrestrial planet.
http://www.space.com/searchforlife/seti_cassini_050414.html