Flyby of Jupiter

Voyager 1 began photographing Jupiter in January 1979. Its closest approach to Jupiter was on March 5, 1979, at a distance of about 349,000 kilometers (217,000 miles) from the planet's centre, before the Voyager 1 finished photographing the Jovian system in April 1979. These images revealed active volcanoes on the moon Io - the such observed on another body in the Solar System.

Flyby of Saturn

Voyager 1 reached Saturn in November 1980, with the closest approach on November 12, 1980, when the space probe came within 124,000 kilometers (77,000 mi) of Saturn's cloud-tops. The space probe's cameras detected complex structures in the rings of Saturn, and its remote sensing instruments studied the atmospheres of Saturn and its giant moon Titan, which was of particular interest as it was known to have an atmosphere (albeit an inhospitable one). Voyager 1 discovered wind speeds on the planet at about 500 m/s (1,100 mph). The rotation of Saturn (the length of a day) was recorded at 10 hours, 39 minutes, 24 seconds.