Premise: Saturn . Titan , Saturn 's largest moon , and the second-largest in the Solar System , is larger than the planet Mercury , although less massive , and is the only moon in the Solar System to have a substantial atmosphere . Solar System . The two largest , Jupiter and Saturn , are gas giants , being composed mainly of hydrogen and helium ; the two outermost planets , Uranus and Neptune , are ice giants , being composed mostly of substances with relatively high melting points compared with hydrogen and helium , called volatiles , such as water , ammonia and methane .
Hypothesis: Saturn is out of the Solar System.
Label: CONTRADICTION