Cassini has been orbiting Saturn for as long as I've been a science writer. From the time of its orbit insertion in June 2004, Cassini was the first regular beat I was asked to cover as a writer at The Planetary Society. So it's especially hard for me to confront the fact that this long, wonderful mission is just about over. A year from today, it's going to plunge into Saturn.

The mission must end because it is nearly out of fuel. Originally planned to last 4 years in orbit, the mission was extended twice to cover Saturn over a total of half of its year around the Sun. Cassini arrived at the height of southern summer, and has watched as the Sun set on the south pole and rose on the north pole. The mission will see Saturn go through northern summer solstice before it ends.

The final year is going to be an exciting one. On November 29, a flyby of Titan will drop Cassini's closest approach to Saturn to a point just 10,000 kilometers beyond the F ring. Cassini will be able to study the weird phenomena of Saturn's rings and ringmoons closer than ever before, and will travel to never-before-sampled regions of Saturn's magnetic field. Then, on April 22, 2017, a final targeted flyby of Titan will shift Cassini's periapsis to a point between the innermost D ring and Saturn. On each close approach to Saturn, it'll fly within 3800 kilometers of the cloud tops. Cassini will see the planet, rings, and energetic particle environment from a new perspective, and have the first ever opportunity to measure the masses of the ring system and Saturn separately. A final nudge by distant Titan on September 15, 2017, will send Cassini to its death.