--- title: Jupiter's moons — a lesson of Mova's school · trees and pragmatics description: «Jupiter's moons», a lesson of the space course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: Jupiter is like a king with a huge court: more than 90 moons go round it, and telescopes keep finding new tiny ones. --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/space/11-jupiters-moons/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [Space](https://md.mova.elamur.ai/free/en/corpora/school/space/) / Jupiter's moons # Jupiter's moons Lesson 11 of the space course of Mova's primary school: 16 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/space/11-jupiters-moons/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/space/11-jupiters-moons/0/) — Jupiter is like a king with a huge court: more than 90 moons go round it, and telescopes keep finding new tiny ones. - [1](https://md.mova.elamur.ai/free/en/corpora/school/space/11-jupiters-moons/1/) — Four of them are big worlds of their own, first seen by Galileo in 1610: Io, Europa, Ganymede and Callisto. - [2](https://md.mova.elamur.ai/free/en/corpora/school/space/11-jupiters-moons/2/) — Each is different: Io is covered in erupting volcanoes, Europa hides an ocean under its ice, Ganymede is the biggest moon of all, and Callisto is battered with craters. - [3](https://md.mova.elamur.ai/free/en/corpora/school/space/11-jupiters-moons/3/) — Think of a playground roundabout with three children holding on at different distances: Io, Europa and Ganymede go round in a steady beat, Io four times while Europa goes twice and Ganymede once. - [4](https://md.mova.elamur.ai/free/en/corpora/school/space/11-jupiters-moons/4/) — Their eclipses, as they slip into Jupiter's shadow, happen so regularly that in the 1600s people used them as a clock in the sky to find their longitude. - [5](https://md.mova.elamur.ai/free/en/corpora/school/space/11-jupiters-moons/5/) — Jupiter has more than 90 known moons, and the count is still rising as telescopes find more tiny ones. - [6](https://md.mova.elamur.ai/free/en/corpora/school/space/11-jupiters-moons/6/) — Galileo discovered Jupiter's four biggest moons, Io, Europa, Ganymede and Callisto, in 1610 with one of the first telescopes. - [8](https://md.mova.elamur.ai/free/en/corpora/school/space/11-jupiters-moons/8/) — Io's yellow, orange and red patches come from sulphur and sulphur compounds spread by its volcanoes. - [9](https://md.mova.elamur.ai/free/en/corpora/school/space/11-jupiters-moons/9/) — Europa has an icy crust over a salty ocean of liquid water that may hold about twice as much water as all the Earth's oceans. - [10](https://md.mova.elamur.ai/free/en/corpora/school/space/11-jupiters-moons/10/) — NASA's Europa Clipper launched in 2024 and should reach Jupiter in 2030 to study whether Europa could support life. - [11](https://md.mova.elamur.ai/free/en/corpora/school/space/11-jupiters-moons/11/) — Ganymede is the largest moon in the Solar System, wider than the planet Mercury. - [12](https://md.mova.elamur.ai/free/en/corpora/school/space/11-jupiters-moons/12/) — Ganymede is the only moon known to have its own magnetic field. - [13](https://md.mova.elamur.ai/free/en/corpora/school/space/11-jupiters-moons/13/) — Callisto is the most heavily cratered object in the Solar System, with a very old surface hardly changed for about 4 billion years. - [14](https://md.mova.elamur.ai/free/en/corpora/school/space/11-jupiters-moons/14/) — For every one orbit of Ganymede, Europa goes round twice and Io four times. - [15](https://md.mova.elamur.ai/free/en/corpora/school/space/11-jupiters-moons/15/) — Europe's JUICE spacecraft, launched in 2023, will reach Jupiter in 2031 and end by orbiting Ganymede. - [16](https://md.mova.elamur.ai/free/en/corpora/school/space/11-jupiters-moons/16/) — In the 1600s the regular eclipses of Jupiter's moons were used as a clock in the sky to work out longitude, how far east or west you are, on land. - ← previous: [Jupiter](https://md.mova.elamur.ai/free/en/corpora/school/space/10-jupiter/) - next →: [Saturn and its rings](https://md.mova.elamur.ai/free/en/corpora/school/space/12-saturn-and-its-rings/) - ↑ back to [Space](https://md.mova.elamur.ai/free/en/corpora/school/space/)