Simplify the following text for a Grade 10 native English-speaking person.
Original: The Cassiniâ `` Huygens team concluded that the imaged features are almost certainly the long-sought hydrocarbon lakes , the first stable bodies of surface liquid found off Earth .
Simplified: The Cassiniâ `` Huygens team decided that the smooth areas are the hydrocarbon lakes they had been searching for , the first lakes found off Earth .