| Term | Definition |
|---|
| Io, Europa, Ganymede, Callisto | the number of Galilean satellites (I eat green carrots) |
| diameters of the satellites | prior to spacecraft, this is what we knew about the Galilean spacecraft |
| transit | a satellite passes between us and Jupiter |
| eclipse | one of the satellites disappears and then reappears as it passes into and out of Jupiter's enourmous shadow |
| occultation | a satellite passes completely behind Jupiter, and the satellite is temporarily blocked from our Earth-based view |
| shadow transits | satellite's shadow falls on Jupiter's cloudtops |
| Io | 3529 kg/m3 [higher than the moon's (made of rock)]; |
| Europa | 3018 kg/m3 [must be mostly rock]; |
| Ganymede | 1936 kg/m3 [mixture of rock and ice] |
| Callisto | 1851 kg/m3 [mixture of rock and ice] |
| synchronous rotation | I.E.G orbital period ration 1:2:4 |
Combine with other sets
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