Last adventure ahead for NASA's Cassini spacecraft at Saturn

This image made available by NASA in April 2017 shows a still from the short film "Cassini's Grand Finale," with the spacecraft diving

This undated photo made available by NASA shows one of Saturn's moons, Mimas, dwarfed by the planet's rings. Launched in 1997, Cassini

This image made by the Cassini spacecraft and provided by NASA on March 12, 2006, shows two of Saturn's moons, the small Epimetheus and

This April 12, 2017 image provided by NASA shows planet Earth and the moon, center left, as small points of light behind the rings of S

CAPE CANAVERAL, Fla. (AP) — NASA's Cassini spacecraft faces one last perilous adventure around Saturn.

Early Saturday, Cassini will swing past Saturn's mega moon Titan. "That last kiss goodbye," as the project manager calls it, will put Cassini on a path no spacecraft has gone before — into the gap between Saturn and its rings. It's treacherous territory. Even a speck from the rings could cripple Cassini, given its velocity.

Cassini will make its first pass through the relatively narrow gap Wednesday. Twenty-two transits are planned until September, when Cassini goes in and never comes out, vaporizing in Saturn's atmosphere.

Launched in 1997, Cassini reached Saturn in 2004 and has been exploring it from orbit ever since. Cassini's fuel tank is almost empty, so NASA has opted for a risky, but science-rich grand finale.