NASA’s Cassini robotic orbiter made a close flyby of Enceladus on December 19, the last targeted Enceladus encounter of the mission. This unprocessed image was taken during Cassini’s close approach to Enceladus on December 19, 2015, and received on Earth day later. Image credit: NASA / JPL-Caltech / Space Science Institute. “This final Enceladus flyby elicits feelings of both sadness and triumph. While we’re sad to have the close flybys behind...