Answer:

Titan, which is one of Saturn's moons, also ( just in case you want to know) Pluto is not a planet

Answer:

We shouldn't forget the extra solar planets (see WikiPedia Article: Extra Solar Planets):

The first discoveries were:

* Pulsar planets around PSR B1257+12. * A "Hot Jupiter" arounf 51 Pegasi

Then the following (by year)

* 1996, 47 Ursae Majoris b * 1998, Gliese 876 b * 1999, Upsilon Andromedae (hree Planets) * 1999, HD 209458 b * 2001, HD 209458 b * 2001, Iota Draconis b * 2003, PSR B1620-26 b * 2004, Mu Arae c * 2004, 2M1207 b * 2005, Gliese 876 d * 2005, HD 149026 b * 2006, OGLE-2005-BLG-390Lb * 2006, HD 69830 (Three Planets) * 2007, HD 209458 b and HD 189733 b * 2007, Gliese 581 c2007, Gliese 436 b * 2007, XO-3b 2007, TrES-4 * 2008, OGLE-2006-BLG-109Lb and OGLE-2006-BLG-109Lc * 2008, HD 189733 b * 2008, HD 40307

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