Crescents Dione and Rhea

Crescents Dione and Rhea
Crescents Dione and Rhea Rhea and Dione were only barely lit crescents (the phase angle was 160 degrees) when Cassini caught the two passing by each other on March 27, 2006. NASA / JPL / SSI / Emily Lakdawalla

"We're changing the world. Are you in?"
- CEO Bill Nye

Sign up for email updates