Saturn's two largest moons meet in the sky in a rare embrace. Smog-enshrouded Titan (5,150 kilometers, or 3,200 miles across) glows to the left of airless Rhea (1,528 kilometers, or 949 miles across).

Saturn's two largest moons meet in the sky in a rare embrace. Smog-enshrouded Titan (5,150 kilometers, or 3,200 miles across) glows to the left of airless Rhea (1,528 kilometers, or 949 miles across).

Cassini's Double Flyby of Rhea and Titan

Cassini ends August with back-to-back fly-bys of Rhea and then Titan.

First up, on Aug. 30, the spacecraft flies within 5,737 kilometers (3,565 miles) of Saturn's second largest moon, Rhea. The icy moon provides a stark contrast to the atmosphere-rich Titan, which gets its close up this time from 3,326 kilometers (2,066 miles) the next day. These fly-bys set up a close encounter with Iapetus on Sept. 10, 2007