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 .
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 Four of them are big worlds of their own, first seen by Galileo in 1610: Io, Europa, Ganymede and Callisto. 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 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 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 Jupiter has more than 90 known moons, and the count is still rising as telescopes find more tiny ones. 6 Galileo discovered Jupiter's four biggest moons, Io, Europa, Ganymede and Callisto, in 1610 with one of the first telescopes. 8 Io's yellow, orange and red patches come from sulphur and sulphur compounds spread by its volcanoes. 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 NASA's Europa Clipper launched in 2024 and should reach Jupiter in 2030 to study whether Europa could support life. 11 Ganymede is the largest moon in the Solar System, wider than the planet Mercury. 12 Ganymede is the only moon known to have its own magnetic field. 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 For every one orbit of Ganymede, Europa goes round twice and Io four times. 15 Europe's JUICE spacecraft, launched in 2023, will reach Jupiter in 2031 and end by orbiting Ganymede. 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 Jupiternext → Saturn and its rings↑ back to Space This page in Markdown → https://md.mova.elamur.ai/free/en/corpora/school/space/11-jupiters-moons/