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Четирите големи месечини, познати како Галилеови месечини, се: Ио, Европа, Ганимед, Калисто.
=== Galilean moons ===
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The orbits of Io, Europa, and Ganymede, the largest moon in the solar system, form a pattern known as a [[Laplace resonance]]; for every four orbits that Io makes around Jupiter, Europa makes exactly two orbits and Ganymede makes exactly one. This resonance causes the [[gravity|gravitational]] effects of the three moons to distort their orbits into elliptical shapes, since each moon receives an extra tug from its neighbors at the same point in every orbit it makes.
[[Податотека:JupiterandIo.jpg|thumb|250px|left|A picture of Jupiter and its moon Io taken by [[Hubble Space Telescope|Hubble]]. The black spot is Io's shadow.]]
The [[tidal force]] from Jupiter, on the other hand, works to circularize their orbits. This constant tug of war causes regular flexing of the three moons' shapes, Jupiter's gravity stretches the moons more strongly during the portion of their orbits that are closest to it and allowing them to spring back to more spherical shapes when they're farther away. This flexing causes tidal heating of the three moons' cores. This is seen most dramatically in Io's extraordinary volcanic activity, and to a somewhat less dramatic extent in the geologically young surface of Europa indicating recent resurfacing.
{| class="wikitable"
|- style="background:#efefef;"
! colspan="6" | The [[Galilean moons]], compared to Earth's moon [[Moon|Luna]]
|-
|- style="background:#efefef;"
! colspan="2" | Name<br />
([[Asteroid pronunciation key|Pronunciation key]])
! Diameter<br />(km)
! Mass<br />(kg)
! Orbital radius (km)
! Orbital period (days)
|- style="background:#ccccff;" align="center"
| '''[[Io (moon)|Io]]''' || ''eye'-oe''<br />{{IPA|ˈaɪəʊ}} || 3643<br />(105% Luna) || 8.9×10<sup>22</sup><br />(120% Luna) ||421 700<br />(110% Luna) ||1.77<br />(6.5% Luna)
|- style="background:#ccccff" align="center"
| '''[[Europa (moon)|Europa]]''' || ''ew-roe'-pə''<br />{{IPA|jʊərəʊpə}} || 3122<br />(90% Luna) || 4.8×10<sup>22</sup><br />(65% Luna) || 671 034<br />(175% Luna) || 3.55<br />(13% Luna)
|- style="background:#ccccff" align="center"
| '''[[Ganymede (moon)|Ganymede]]''' || ''gan'-ə-meed''<br />{{IPA|ˈgænəmid}} || 5262<br />(150% Luna) || 14.8×10<sup>22</sup><br />(200% Luna) || 1 070 412<br />(280% Luna) || 7.15<br />(26% Luna)
|- style="background:#ccccff" align="center"
| '''[[Callisto (moon)|Callisto]]''' || ''kə-lis'-toe''<br />{{IPA|kəˈlɪstəʊ}} || 4821<br />(140% Luna) || 10.8×10<sup>22</sup><br />(150% Luna) || 1 882 709<br />(490% Luna) || 16.69<br />(61% Luna)
|}
=== Класификација на месечините на Јупитер ===
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