... The Earth's magnetosphere is not unique. Space probes which have visited the giant planets--Jupiter, Saturn, Uranus and Neptune--found that all were magnetized, even more intensely than the Earth, and all were surrounded by radiation belts. ... The Sun, stars and the distant visible universe are mostly plasma, and it turns out that like the magnetosphere, they too can contain high-energy particles, some of them energized above and beyond the levels found in the Earth's magnetosphere. ...
... The Earth's magnetosphere is not unique. Space probes which have visited the giant planets--Jupiter, Saturn, Uranus and Neptune--found that all were magnetized, even more intensely than the Earth, and all were surrounded by radiation belts. ... The earliest evidence came from cosmic rays , discovered in 1912 by Victor Hess. ... In the biggest events, a few times each solar cycle, such ions spread throughout interplanetary space, at energies which can reach those of low-energy cosmic rays. ...
... Voyager 1 completed its Jupiter encounter in early April, after taking almost 19,000 pictures and many other scientific measurements. ... Its outer edge is 129,000 kilometers (80,000 miles) from the center of the planet, and, though the brightest portion is only about 6,000 kilometers (4,000 miles) wide, ring material may extend another 50,000 kilometers (30,000 miles) downward to the top of Jupiter's atmosphere. ... Jupiter Space History The Voyager Planetary Mission Voyager Saturn Science Summary ...