Saturn swan song: A look back at the most captivating images captured by NASA's Cassini

For the last 13 years, NASA's Cassini spacecraft has orbited Saturn to capture remarkable images of the planet's otherworldly beauty. As it ends its mission, here is a look at some its most incredible.

Robert Lawrence has worked in academic research and public health, and now writes about science. He studied biochemistry at the University of Utah and Arizona State University. You can find more of his work at