On September 15, 2017, NASA’s Cassini spacecraft will take its final measurements and images as it plunges into Saturn’s atmosphere at 77,000 miles per hour, burning up high above the cloud tops. Launched in 1997, Cassini traveled 2.2 billion miles in seven years to reach Saturn and enter orbit. Over the past 13 years, Cassini’s instruments have returned countless priceless scientific observations and hundreds of thousands of images of the Saturnian system—its atmosphere, its 60+ moons, its vast rings, and much more. Gathered here are 40 of the most amazing images sent to us from Cassini, as we prepare for this epic mission to come to an end in just a few months.