The little grey ball is Dione, the third largest of Saturn's moons. The large brown sphere with the ethereal haze is Titan, the largest. In the background, that's Saturn and its rings. Never has an astronomy picture looked so painterly to me.
...and it's only a few hundred million miles away. Better fuel up your rocket and get started today, however, because we're talking about Saturn's moon Enceladus and the incredibly fine, snowy powder that covers its surface: