On Sept. 24th, the Cassini spacecraft's narrow-angle camera captured an incredible view of Saturn's moons, Enceladus and Tethys, as they lined up almost perfectly into a cosmic 'bullseye.' The view captures the unilluminated side of Saturn's rings, along with the two celestial bodies just above it. Since the moons are both at similar distances from the spacecraft, NASA says the image shows a fairly accurate representation of their relative sizes.
Enceladus and Tethys line up almost perfectly for Cassini's cameras. The image was taken in red light with the Cassini spacecraft narrow-angle camera on Sept. 24, 2015. NASA/JPL-Caltech/Space Science Institute