---
title: Thinking like an astronomer — how Mova does on the tests · World
description: Lesson 10 of the world course of Mova's primary school: 5 of 13 tests right, exam 2 of 4, every question with the options, the student's choice, the right answer and why it chose.
---

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# Thinking like an astronomer

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**Tests:** 5 of 13 right · **Exam:** 2 of 4 right · **Kind:** ★★★ · **Understood:** 10 of 17 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 10 of the world 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](https://md.mova.elamur.ai/free/en/corpora/school/world/10-reasoning-about-space/).

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Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: [the lesson's questions in the corpora](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/).

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### Test 1 · ★★★ · wrong ✗ {#t1}

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If the Moon did not turn on its axis at all, what would we see from the Earth over a month?

- **1.** No Moon at all — score 4
- **2.** Only the far side of the Moon — **← Mova's choice** · score 7
- **3.** Always the same face, as now — score 6
- **4.** All sides of the Moon in turn — **✓ the right answer** · score 7

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**Why:** It took the question to ask what it is done to. It chose option 2 with score 7, tied with another option at 7 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 10, line 7: «Because of this, we always see the same side of the Moon from the Earth.», reached through the option's own match among the sentences about the question's things. What matched: it fills the role the question asks for (+3); the same action «see» (+2); the same thing acted on «same side» (+2). The right option, 4, scored 7. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/t1/)

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### Test 2 · ★★★ · wrong ✗ {#t2}

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On the Earth a bathroom scale shows 30 kilograms for a girl. What would the same scale show on the Moon?

- **1.** About 0 kilograms — **← Mova's choice** · no support
- **2.** About 5 kilograms — **✓ the right answer** · no support
- **3.** About 180 kilograms — no support
- **4.** About 30 kilograms — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/t2/)

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### Test 3 · ★★★ · wrong ✗ {#t3}

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A boy says: «On the Moon I would be lighter because I would be smaller.» What is wrong?

- **1.** He would be heavier on the Moon — no support
- **2.** He stays the same size; only the pull of gravity is weaker — **✓ the right answer** · no support
- **3.** Nothing is wrong; people really do shrink a little on the Moon — no support
- **4.** The Moon has stronger gravity than the Earth — **← Mova's choice** · score 8

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 8, the only option with support. Its support: lesson 8, line 7: «In a solar eclipse the Moon is between the Sun and the Earth.», reached through the remembered sentence the question matched. What matched: the same doer «moon» (+4); the same circumstance (+4). The right option, 2, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/t3/)

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### Test 4 · ★★★ · wrong ✗ {#t4}

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Which is true?

- **1.** A bag of rice has more mass on the Moon — **← Mova's choice** · no support
- **2.** A bag of rice has the same mass on the Earth and on the Moon — **✓ the right answer** · no support
- **3.** A bag of rice has the same weight everywhere — no support
- **4.** A bag of rice has no mass in space — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/t4/)

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### Test 5 · ★★★ · wrong ✗ {#t5}

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A planet has no air at all. What colour is its sky in daylight?

- **1.** Blue — **← Mova's choice** · no support
- **2.** Black — **✓ the right answer** · no support
- **3.** Red — no support
- **4.** White — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/t5/)

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### Test 6 · ★★★ · right ✓ {#t6}

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Why is it not true that there is a «dark side of the Moon» that never sees the Sun?

- **1.** Every side of the Moon faces the Sun at some time each month — **← Mova's choice** · **✓ the right answer** · score 7
- **2.** The Moon makes its own light on the far side — score 4
- **3.** Mirrors on the Moon reflect light there — no support
- **4.** The Earth lights up the whole far side with the glow of its big cities — no support

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**Why:** It took the question to ask why something happens (its cause). It chose option 1 with score 7, against 4 for the next best. Its support: lesson 3, line 11: «At new moon the Moon is between the Earth and the Sun, and its dark side faces us.», reached through the option's own match among the sentences about the question's things. What matched: the same action «face» (+4); the same doer «dark side» (+3). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/t6/)

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### Test 7 · ★★★ · wrong ✗ {#t7}

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If the universe had always existed with stars everywhere and light had forever to travel, what might the night sky look like?

- **1.** Completely dark with no stars — **← Mova's choice** · score 8
- **2.** Blue like the daytime sky — no support
- **3.** Bright in every direction — **✓ the right answer** · score 3
- **4.** Exactly as dark as it is now — score 8

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**Why:** It took the question to ask a circumstance (with what, when, how). It chose option 1 with score 8, tied with another option at 8 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 10, line 4: «The sky is blue by day because the air scatters the blue part of sunlight all over the sky; on the Moon, with no air, the sky is black even at noon and the sta…», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+6); the same circumstance (+4). Against it: a different action (counts against) (-2). The right option, 3, scored 3. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/t7/)

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### Test 8 · ★★★ · right ✓ {#t8}

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An astronaut on the Moon throws a ball as hard as on the Earth. Why does it fly much farther?

- **1.** The weaker gravity pulls it down more slowly, and there is no air to slow it — **← Mova's choice** · **✓ the right answer** · no support
- **2.** The Moon's air pushes it forward — no support
- **3.** The ball becomes lighter in mass on the Moon, so the same throw sends it farther — no support
- **4.** The Moon spins faster under it — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/t8/)

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### Test 9 · ★★★ · right ✓ {#t9}

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Which shows best that the Moon turns on its axis?

- **1.** It keeps the same face to us while going all the way around us — **← Mova's choice** · **✓ the right answer** · score 13
- **2.** It looks much bigger when it is low near the horizon than when high up — score 11
- **3.** It rises in the east — score 13
- **4.** It has phases every month — score 6

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**Why:** It took the question to ask who or what does it. It chose option 1 with score 13, tied with another option at 13 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 10, line 1: «The Moon turns around its own axis exactly once while it goes around the Earth once, so it always keeps the same face towards us: walk around a chair while alw…», reached through the option's own match among the sentences about the question's things. What matched: it fills the role the question asks for (+5); the same doer «moon» (+4); the same action «keep» (+2); the same thing acted on «same face» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/t9/)

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### Test 10 · ★★★ · wrong ✗ {#t10}

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why do we only ever see one side of the moon

- **1.** The other side is always in the dark — score 1
- **2.** The Earth blocks our view of the far side — **← Mova's choice** · score 8
- **3.** It turns once in the same time it goes round us — **✓ the right answer** · no support
- **4.** The Moon doesn't turn at all — no support

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 8, against 1 for the next best. Its support: lesson 3, line 12: «At full moon the Earth is between the Sun and the Moon, and we see the whole lit side.», reached through the remembered sentence the question matched. What matched: the same action «see» (+4); the same thing acted on «whole lit side» (+4). The right option, 3, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/t10/)

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### Test 11 · ★★★ · right ✓ {#t11}

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if i jump on the moon how high can i go compared to here

- **1.** About six times higher — **← Mova's choice** · **✓ the right answer** · no support
- **2.** About the same height — no support
- **3.** About two times higher — no support
- **4.** About a hundred times higher — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/t11/)

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### Test 12 · ★★★ · wrong ✗ {#t12}

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my brother says the far side of the moon is always dark, it's the "dark side". true?

- **1.** No, it gets sunlight too, we just never see it — **✓ the right answer** · score 5
- **2.** Yes, the Sun never shines on it — score 4
- **3.** No, it's lit only at full moon — score 3
- **4.** Yes, it's dark because it faces away from Earth — **← Mova's choice** · score 8

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 8, against 5 for the next best. Its support: lesson 3, line 11: «At new moon the Moon is between the Earth and the Sun, and its dark side faces us.», reached through the remembered sentence the question matched. What matched: the same action «face» (+4); the same doer «dark side» (+4). The right option, 1, scored 5. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/t12/)

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### Test 13 · ★★★ · right ✓ {#t13}

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Mia reckons you'd weigh less on the moon cos your mass goes down. right?

- **1.** Yes, both your mass and your weight halve up there — no support
- **2.** No, your mass stays the same; the Moon pulls less — **← Mova's choice** · **✓ the right answer** · score 6
- **3.** Yes, you lose some of your mass when you go into space — no support
- **4.** No, you'd weigh more there because the Moon is smaller — score 4

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 6, against 4 for the next best. Its support: lesson 10, line 2: «Your mass, the amount of you, is the same everywhere, but your weight is the pull of gravity on you; the Moon has much less mass than the Earth, so it pulls ab…», reached through the remembered sentence the question matched. What matched: the same doer «mass» (+4); the same property (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/t13/)

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### Exam question 1 · formal language · wrong ✗ {#e1}

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Identify the principal reason for which the same face of the Moon is perpetually presented to the Earth.

- **1.** Its rotation and its revolution about the Earth occupy equal periods — **✓ the right answer** · no support
- **2.** It does not rotate upon its axis at all — no support
- **3.** The Earth's gravity prevents it from turning — **← Mova's choice** · score 6
- **4.** Its far side is permanently in darkness — no support

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**Why:** It took the question to ask which statement is true. It chose option 3 with score 6, the only option with support. Its support: lesson 6, line 4: «In the same way the Sun's gravity keeps the Earth and the other planets going around it.», reached through the option's own match among the sentences about the question's things. What matched: the same action «keep» (+2); the same doer «gravity» (+2); the same thing acted on «earth» (+2). The right option, 1, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/e1/)

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### Exam question 2 · formal language · right ✓ {#e2}

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It is given that an object possesses a mass of 60 kilograms upon the Earth. Ascertain its mass upon the Moon.

- **1.** Sixty kilograms — **← Mova's choice** · **✓ the right answer** · no support
- **2.** Three hundred and sixty kilograms — no support
- **3.** Zero kilograms — no support
- **4.** Ten kilograms — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/e2/)

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### Exam question 3 · formal language · wrong ✗ {#e3}

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Identify the principal reason for which the lunar sky appears black even during the lunar day.

- **1.** The lunar dust absorbs the whole of the light that falls upon it — **← Mova's choice** · no support
- **2.** The Earth obstructs the sunlight before it reaches the Moon — no support
- **3.** The Moon possesses no atmosphere to scatter sunlight — **✓ the right answer** · no support
- **4.** The Sun does not illuminate the surface of the Moon at all — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/e3/)

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### Exam question 4 · formal language · right ✓ {#e4}

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Select the response that is consistent with the established facts concerning the far side of the Moon.

- **1.** It is illuminated solely by the Earth — no support
- **2.** It remains in perpetual darkness — no support
- **3.** It emits a light of its own — no support
- **4.** It receives sunlight in the same manner as the near side — **← Mova's choice** · **✓ the right answer** · score 3

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 3, the only option with support. Its support: lesson 10, line 8: «The far side of the Moon gets sunlight too; it is not always dark.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «sunlight» (+2); the same circumstance (+2). Against it: a different doer (counts against) (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/world/10-reasoning-about-space/e4/)

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