Orbs Align

Dione and Rhea pair up for an occultation, or mutual event, as seen by 
Cassini. While the lit portion of each moon is but a crescent, the dark 
side of Dione has begun to take a bite out of its distant sibling moon

Dione and Rhea pair up for an occultation, or mutual event, as seen by Cassini. While the lit portion of each moon is but a crescent, the dark side of Dione has begun to take a bite out of its distant sibling moon