NASA's Cassini spacecraft ends mission to Saturn

Engineer Mar Vaquero monitors the status of NASA's Cassini spacecraft as it enters the atmosphere of Saturn in mission control at NASA's Jet Propulsion Laboratory, Friday, Sept. 15, 2017, in Pasadena, Calif. Cassini disintegrated in the skies above Saturn early Friday, following a remarkable journey of 20 years. [Photo: AP/Jae C. Hong, Pool]

Engineers monitor the status of NASA's Cassini spacecraft in mission control at NASA's Jet Propulsion Laboratory, Friday, Sept. 15, 2017, in Pasadena, Calif. Cassini disintegrated in the skies above Saturn early Friday, following a remarkable journey of 20 years. [Photo: AP/Jae C. Hong, Pool]

Project manager Earl Maize, center, left, and flight director Julie Webster hug in mission control at NASA's Jet Propulsion Laboratory, Friday, Sept. 15, 2017, in Pasadena, Calif., after confirmation of Cassini's demise. Cassini disintegrated in the skies above Saturn early Friday, following a remarkable journey of 20 years. [Photo: AP/Jae C. Hong, Pool]

Flight director Julie Webster reacts in mission control at NASA's Jet Propulsion Laboratory after confirmation of Cassini's demise Friday, Sept. 15, 2017, in Pasadena, Calif. Cassini disintegrated in the skies above Saturn early Friday, following a remarkable journey of 20 years. [Photo: AP/Jae C. Hong, Pool]

This Wednesday, Sept. 13, 2017 image shows the northern hemisphere of Saturn as seen from the Cassini spacecraft on its descent towards the planet. The probe disintegrated in the skies above the Saturn early Friday after a 20-year mission. [Photo: NASA/JPL-Caltech/Space Science Institute via AP]