Scientists have recently discovered that Saturn's largest moon, Titan, might have an icy, slushy interior, instead of liquid as was previously concluded.

For more than a decade, NASA’s Cassini spacecraft traced Saturn’s rings and moons, returning some of the most detailed planetary data ever collected. Titan, Saturn’s largest moon, drew special focus.

NASA’s latest look at Saturn’s largest moon has upended one of planetary science’s favorite assumptions: Titan probably does not hide a single, global ocean of liquid water beneath its crust. Instead, ...