For over a decade, Cassini spacecraft of NASA has been in Saturn orbit and has observed the entire spectrum of ringed planet delights. However there are some views in Saturnian orbit that are more satisfactory in comparison to watching multiple moons in the same frame, mainly during alignment.

On September 24, Cassini captured Enceladus coming on front of bigger moon Tethys in almost perfect alignment. It was interested to observe that the size difference between the 2 moons closely reflected their relative distinctions in diameter with Enceladus was 313 miles (504 kilometers) across while Tethys was 660 miles (1,062 kilometers) across.

The moment when the moon transited, Cassini was as a distance of 1.3 million miles (2.1 million kilometers) from Enceladus and 1.6 million miles (2.6 million kilometers) from Tethys. This suggested that the 2 moons were just nearly 300,000 miles apart.

Enceladus holds a lot of scientific importance for NASA and the Cassini mission. The small moon, which is now known to have a sub-surface ocean underneath an icy crust, is thought to have the ingredients essential for life.

Presently, Cassini is all set for its last ever flyby of Enceladus on December 19, an encounter called E-22 (the 22nd flyby), during which it will come within 3,106 miles (4,999 kilometers) of the surface of moon.