After over 7,000 days in space, the Cassini mission ended on Sept. 15, 2017. Since its Oct. 15, 1997 launch, the spacecraft had returned a wealth of new knowledge and images of Saturn and its moons.

As Cassini approached its fiery end in Saturn’s upper atmosphere, it kept transmitting right up to the last second. The final photos it captured weren’t just scientifically vital - they were ...