Jupiter's moons

Tests: 3 of 11 right · Exam: 1 of 4 right · Kind: plain · Understood: 6 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 11 of the space course of Mova's primary school, as Mova's small model took its tests: it had read this lesson and the ones before it and learned from their exercises. Each test shows the options in the order the student saw them, its choice, the right answer, the score of every option and why it chose. The lesson itself, sentence by sentence with trees and pragmatics: the lesson in the corpora.

Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: the lesson's questions in the corpora.

Test 1 · right ✓

My mate says the Earth's Moon is the biggest moon there is. right?

1. Yes, moons can never be bigger than our Moon — no support
2. No, Io is the biggest, because it is hottest — no support
3. No, Ganymede is the biggest, wider than Mercury — ← Mova's choice · ✓ the right answer · score 7
4. Yes, our Moon is the biggest of all, it just looks small — score 4

Why: It took the question to ask which statement is true. It chose option 3 with score 7, against 4 for the next best. Its support: lesson 11, line 3: «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…», reached through the option's own match among the sentences about the question's things. What matched: the same doer «ganymede» (+4); the same property (+2); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics

Test 2 · wrong ✗

In a cartoon, Io is drawn as a grey, dead ball like our Moon. What should it look like?

1. Pure white, covered in smooth ice — ← Mova's choice · no support
2. Black, with no light at all — no support
3. Blue, covered all over by a deep open ocean of water — no support
4. Yellow, orange and red, with erupting volcanoes — ✓ the right answer · no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 3 · wrong ✗

why would anyone send a probe all the way to Europa, it's just ice innit

1. It is made of gold under the ice — ← Mova's choice · no support
2. Its ice may hide a huge ocean that could support life — ✓ the right answer · no support
3. It is the closest moon to the Earth — no support
4. It has the most volcanoes in the Solar System — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 4 · wrong ✗

If Europa goes round Jupiter 10 times, about how many times does Io go round in the same time?

1. 5 — ← Mova's choice · score 12
2. 20 — ✓ the right answer · score 12
3. 10 — score 12
4. 40 — score 12

Why: It took the question to ask what it is done to. It chose option 1 with score 12, tied with another option at 12 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 7, line 1: «The Sun always lights half of the Moon, like a lamp lighting half of a ball; as the Moon goes round us we see more or less of that lit half, and these are the…», reached through the remembered sentence the question matched. What matched: the same doer «moon» (+5); the same action «go round» (+4); the same property (+3). The right option, 2, scored 12. · the question and its options parsed, with trees and pragmatics

Test 5 · right ✓

A sailor in 1680 has an accurate table of when Jupiter's moons slip into its shadow. What can he work out from it on land?

1. Tomorrow's weather — no support
2. His age — no support
3. His longitude — ← Mova's choice · ✓ the right answer · score 0
4. The depth of the sea — no support

Why: It took the question to ask what it is done to. It chose option 3 with score 0, the only option with support. Its support: lesson 11, line 5: «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.», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+2); the same thing acted on «longitude» (+1). Against it: a different doer (counts against) (-1); a different action (counts against) (-2). · the question and its options parsed, with trees and pragmatics

Test 6 · wrong ✗

Which is true?

1. Jupiter has exactly four moons and always will — ← Mova's choice · no support
2. Scientists stopped looking for moons in 1610 — no support
3. Jupiter loses a moon every year — no support
4. Jupiter's moon count keeps rising as telescopes find tiny new moons — ✓ the right answer · no support

Why: Nothing it remembers matched the question, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 7 · wrong ✗

Sam reckons Callisto must be young cos it's covered in craters. what's wrong with that?

1. Many craters mean an old surface that has hardly changed — ✓ the right answer · no support
2. Craters only form on young moons — no support
3. Craters are made by Callisto's volcanoes — ← Mova's choice · score 5
4. Callisto has no craters at all — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 5, the only option with support. Its support: lesson 6, line 10: «The Moon is covered in craters, some hundreds of kilometres wide, made by asteroids and comets hitting it.», reached through the option's own match among the sentences about the question's things. What matched: the same action «make» (+3); the same thing acted on «craters» (+2). The right option, 1, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 8 · wrong ✗

Two spacecraft are on their way to Jupiter's moons. Which pair is right?

1. JUICE for Io, Clipper for Callisto — ← Mova's choice · no support
2. Voyager for Io, and the old Apollo craft for Callisto — no support
3. Europa Clipper for Europa, JUICE ending at Ganymede — ✓ the right answer · no support
4. Cassini for Europa, Huygens for Ganymede — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 9 · wrong ✗

lol my sister thinks Io's yellow cos it's made of cheese. what really makes it yellow

1. Yellow sand blown from Jupiter — ← Mova's choice · no support
2. Sunlight bouncing off ice — no support
3. Gold dust from space — no support
4. Sulphur from its volcanoes — ✓ the right answer · no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 10 · right ✓

A game shows a moon with its own magnetic field going round Jupiter. Which moon can it be?

1. Europa — score 5
2. Io — score 5
3. Callisto — score 5
4. Ganymede — ← Mova's choice · ✓ the right answer · score 6

Why: It took the question to ask who or what does it. It chose option 4 with score 6, against 5 for the next best. Its support: lesson 11, line 3: «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…», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+3); the same light verb (be, have, do, get, go) (+2); the same doer «ganymede» (+1). · the question and its options parsed, with trees and pragmatics

Test 11 · wrong ✗

Why could Galileo see only four of Jupiter's moons?

1. The others are tiny and far too faint for his telescope — ✓ the right answer · no support
2. The others hide behind Jupiter all the time — no support
3. The other moons appeared after his death — ← Mova's choice · score 2
4. Jupiter had only four moons in 1610 — score 2

Why: It took the question to ask why something happens (its cause). It chose option 3 with score 2, tied with another option at 2 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 7, line 1: «The Sun always lights half of the Moon, like a lamp lighting half of a ball; as the Moon goes round us we see more or less of that lit half, and these are the…», reached through the cause of the sentence the question matched. What matched: the same doer «moon» (+4). Against it: a different action (counts against) (-2). The right option, 1, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · right ✓

State the number of natural satellites presently known to orbit the planet Jupiter.

1. In excess of ninety — ← Mova's choice · ✓ the right answer · no support
2. None whatsoever, at present — no support
3. Precisely one, as the Earth has — no support
4. Precisely four, as Galileo saw — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · wrong ✗

Identify the satellite of Jupiter which is distinguished as the largest moon within the Solar System.

1. Europa — ← Mova's choice · no support
2. Callisto — no support
3. Ganymede — ✓ the right answer · no support
4. Io — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · wrong ✗

Select the response that is consistent with the established facts concerning the interior of Europa.

1. Its interior consists entirely of molten iron — ← Mova's choice · no support
2. It is composed throughout of solid sulphur — no support
3. A saline ocean of liquid water lies beneath its icy crust — ✓ the right answer · no support
4. It is hollow and filled with gas — no support

Why: Nothing it remembers matched the question, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · wrong ✗

Identify the principal purpose for which the eclipses of the satellites of Jupiter were employed during the seventeenth century.

1. The measurement of the Earth's mass — ← Mova's choice · no support
2. The calculation of the date of Easter each year — no support
3. The prediction of tides — no support
4. The determination of longitude on land — ✓ the right answer · no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/space/11-jupiters-moons/