Answer:
Jupiter and Saturn.
Step-by-step explanation:
Voyager 1 is an unmanned space probe in the Voyager program that was launched into space by NASA on September 5, 1977. Voyager 1's top discoveries include Jupiter's moon Ios active volcanoes. The discovery was unexpected because no traces of volcanism had been noticed from terrestrial observations or the previous passing probes Pioneer 10 and Pioneer 11. Voyager 1 took the first close-ups of Jupiter's and Saturn's moons, and discovered new rings around both giant planets. The probe also revealed that the Big Red Spot on Jupiter was a huge storm system.