Simplify the following text for a Grade 6 native English-speaking person.
Original: The Lakes of Titan , a moon of Saturn , are bodies of liquid ethane and methane that have been detected by the Cassiniâ `` Huygens space probe , and had been suspected long before .
Simplified: The lakes of Titan , a moon of Saturn , are made of liquid methane . The lakes were found by the Cassini-Huygens space probe .