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During Cassini's flyby of Jupiter, it discovered that the magnetosphere was bigger than expected. Like past missions, it also detected sulfur and oxygen from volcanoes on Jupiter's moon Io even at the outer edge of the magnetosphere.
Cassini was equipped with a radar instrument that was designed to penetrate the haze of Saturn's largest moon Titan and map its surface. But during its Jupiter flyby, Cassini used the radar antenna to measure the high-energy electrons trapped in Jupiter's radiation belts, a donut-shaped region of the magnetosphere that surrounds the planet. The radiation belts contain energetic particles that can damage a spacecraft's electronics. As a means of protection, Juno's instruments are enclosed in a vault.