The inside of Titan is probably made of ice, so scientists guess that the surface might be covered with ice, and maybe have an ocean of methane!

Because the surface can't be seen, no one knows the history of Titan. This means no one can say whether the surface is covered with craters, like Callisto, has volcanos, like Io or is smooth like Europa.

The interior of Titan is probably icy, so guesses about what exists on the surface include an ocean of methane, a surface of ice, or perhaps both.

Because the surface can't be seen, no one knows how evolved Titan is, and no one can say whether the surface is covered with craters, like that of Callisto, has volcanos, like Io or is as smooth as that of Europa.

The interior of Titan is probably icy, so conjecture about what exists on the surface include an ocean of methane, a surface of ice, or perhaps both.

Because the surface can't be seen, no one knows how evolved Titan is, and no one can say whether the surface is marred with craters, like that of Callisto, has volcanos, like Io or is as smooth as that of Europa.