The largest moons of Jupiter should be visible to the naked eye (Io, magnitude 5.5m; Europa, magnitude 5.7m;
| September 22, 2020 | Education
The largest moons of Jupiter should be visible to the naked eye (Io, magnitude 5.5m; Europa, magnitude 5.7m; Ganymede, magnitude 5.1m). Why, then, can they only be observed in optical instruments?
Observations with the naked eye are interfered with by irradiation from a bright planet.
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