Purple haze is seen around the Saturn moon Titan in October 2004 as the international Cassini spacecraft makes a fly-by of Saturn's largest moon -- the closest ever performed. Bigger than Mercury and Pluto, Titan is of particular interest to scientists because it is one of the few moons in the solar system with its own atmosphere. The moon is cloaked in a thick, smog-like haze that scientists believe may be very similar to Earth's before life began more than 3.8 billion years ago. Further study of the moon promises to reveal much about planetary formation and perhaps about the early days of Earth. (More) (© AP Images)