---
title: Black holes — how Mova does on the tests · Space
description: Lesson 25 of the space course of Mova's primary school: 2 of 10 tests right, exam 0 of 4, every question with the options, the student's choice, the right answer and why it chose.
---

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# Black holes

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**Tests:** 2 of 10 right · **Exam:** 0 of 4 right · **Kind:** ★★ · **Understood:** 7 of 14 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 25 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](https://md.mova.elamur.ai/free/en/corpora/school/space/25-black-holes/).

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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/space/25-black-holes/).

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### Test 1 · ★★ · right ✓ {#t1}

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Leo reckons black holes go round space sucking up everything like a hoover. Is he right?

- **1.** Yes, they move towards anything near them — no support
- **2.** No, black holes have no gravity at all — no support
- **3.** Yes, they suck in whole galaxies from anywhere in space at once — score 6
- **4.** No, far away their pull is like any star of the same mass — **← Mova's choice** · **✓ the right answer** · score 7

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 7, against 6 for the next best. Its support: lesson 25, line 4: «Far from a black hole its pull is just like that of any star of the same mass: if the Sun became a black hole, Earth would keep circling, only cold and dark.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «hole» (+4); the same action «pull» (+3). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/space/25-black-holes/t1/)

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### Test 2 · ★★ · wrong ✗ {#t2}

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A film shows a black hole as a bright glowing ball. What is wrong?

- **1.** Nothing, black holes shine more brightly than any star does — **← Mova's choice** · no support
- **2.** Black holes are always bright purple, not white or yellow — no support
- **3.** Light cannot escape it, so the hole itself is dark — **✓ the right answer** · no support
- **4.** Black holes are far too small to show up on a big screen — 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/space/25-black-holes/t2/)

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### Test 3 · ★★ · wrong ✗ {#t3}

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Astronomers see a star whizzing in a tight orbit round an empty-looking spot. What might be there?

- **1.** Nothing, stars often circle nothing — score 5
- **2.** A black hole — **✓ the right answer** · score 4
- **3.** A gap in the telescope's mirror — no support
- **4.** A planet bigger than the star — **← Mova's choice** · score 6

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 6, against 5 for the next best. Its support: lesson 23, line 2: «We live inside the disc, so when we look along it we see a pale band of countless stars stretching across a dark sky.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «countless stars» (+4); the same place «dark sky» (+2). The right option, 2, scored 4. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/space/25-black-holes/t3/)

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### Test 4 · ★★ · wrong ✗ {#t4}

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If an astronaut came back after a long stay near a black hole, how might her clock compare?

- **1.** It would show time going backwards — **← Mova's choice** · no support
- **2.** It would show more time passed, because time speeds up there — no support
- **3.** It would show less time passed than clocks on Earth — **✓ the right answer** · no support
- **4.** It would show exactly the same — 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/space/25-black-holes/t4/)

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### Test 5 · ★★ · wrong ✗ {#t5}

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Why can't a telescope take a normal photo of the black hole itself?

- **1.** It is always hidden behind the Sun — no support
- **2.** It moves too fast for a camera — score 3
- **3.** No light escapes from inside it — **✓ the right answer** · score 2
- **4.** It is too hot to photograph — **← Mova's choice** · score 5

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**Why:** It took the question to ask why something happens (its cause). It chose option 4 with score 5, against 3 for the next best. Its support: lesson 2, line 17: «Telescopes such as ALMA in Chile have photographed dusty discs around young stars where new planets are forming right now.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «telescopes» (+3); the same action «photograph» (+2). The right option, 3, scored 2. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/space/25-black-holes/t5/)

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### Test 6 · ★★ · right ✓ {#t6}

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Your little brother is scared a black hole will eat Earth tonight. What is true?

- **1.** Black holes eat a planet every night — no support
- **2.** No known black hole is close enough to harm us — **← Mova's choice** · **✓ the right answer** · score 7
- **3.** One is just behind the Moon — no support
- **4.** The Sun will turn into one tomorrow and pull the Earth in — score 4

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 7, against 4 for the next best. Its support: lesson 25, line 9: «The nearest known black holes are more than a thousand light years away, far too far to harm us.», reached through the remembered sentence the question matched. What matched: the same doer «nearest known black holes» (+4); the same action «harm» (+3). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/space/25-black-holes/t6/)

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### Test 7 · ★★ · wrong ✗ {#t7}

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Why could the Sun not simply turn into a black hole one day?

- **1.** It is not heavy enough to collapse into one — **✓ the right answer** · score 4
- **2.** It is made of the wrong kind of gas — **← Mova's choice** · score 6
- **3.** It is too far from the galaxy's centre — score 6
- **4.** It burns too slowly — score 4

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**Why:** It took the question to ask why something happens (its cause). It chose option 2 with score 6, tied with another option at 6 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 1, line 1: «The Sun is a star, the same kind of thing as the tiny dots you see at night, only so close that it fills our day with light.», reached through the cause of the sentence the question matched. What matched: the same doer «sun» (+4); the same circumstance (+4). Against it: a different thing acted on (counts against) (-2). The right option, 1, scored 4. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/space/25-black-holes/t7/)

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### Test 8 · ★★ · wrong ✗ {#t8}

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Two black holes crash a billion light years away. What do we pick up on Earth?

- **1.** A bright flash that lights up the night sky for a whole week — **← Mova's choice** · no support
- **2.** A loud bang heard by everyone across the whole of the Earth — no support
- **3.** Tiny ripples in space called gravitational waves — **✓ the right answer** · no support
- **4.** A strong earthquake that shakes the ground all round the Earth — 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/space/25-black-holes/t8/)

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### Test 9 · ★★ · wrong ✗ {#t9}

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Which is true about a supermassive black hole?

- **1.** It is no heavier than a planet — **← Mova's choice** · no support
- **2.** It only forms in empty space — no support
- **3.** It sits deep at the centre of the Earth, inside the core — no support
- **4.** It can be billions of times the Sun's mass — **✓ the right answer** · 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/space/25-black-holes/t9/)

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### Test 10 · ★★ · wrong ✗ {#t10}

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in a game u fly into a black hole and pop out somewhere else lol. is that real

- **1.** Yes, but only small black holes — **← Mova's choice** · no support
- **2.** No one knows of any way out: nothing comes back across the horizon — **✓ the right answer** · no support
- **3.** Yes, every black hole is a tunnel that leads to a different part of space — no support
- **4.** Yes, scientists have done it — 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/space/25-black-holes/t10/)

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

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Which of the following statements most accurately characterises the event horizon of a black hole?

- **1.** It is the point at which light escapes — **← Mova's choice** · no support
- **2.** It is the bright, hard surface of the black hole itself — no support
- **3.** It is the boundary beyond which nothing can return — **✓ the right answer** · no support
- **4.** It is the orbit of the nearest star — 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/space/25-black-holes/e1/)

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### Exam question 2 · formal language · wrong ✗ {#e2}

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Ascertain the consequence for the Earth's orbit were the Sun replaced by a black hole of equal mass.

- **1.** The Earth would be expelled from the solar system — no support
- **2.** The Earth would be drawn into the black hole at once — no support
- **3.** The Earth would cease to move — **← Mova's choice** · score 7
- **4.** The Earth would continue in its orbit as before — **✓ the right answer** · score 4

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**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 20, line 8: «The evening constellations change through the year because the Earth moves round the Sun, so at night we face a different part of space each season; in summer…», reached through the option's own match among the sentences about the question's things. What matched: the same doer «earth» (+4); the same action «move» (+3). The right option, 4, scored 4. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/space/25-black-holes/e2/)

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

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Identify the phenomenon first detected by the LIGO instruments in 2015.

- **1.** The first image of a black hole's shadow — **← Mova's choice** · no support
- **2.** Light emitted from inside a black hole — no support
- **3.** Radio signals from intelligent life — no support
- **4.** Gravitational waves from merging black holes — **✓ the right answer** · 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/space/25-black-holes/e3/)

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### Exam question 4 · formal language · wrong ✗ {#e4}

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Select the response that is consistent with the established facts concerning the means by which black holes are detected.

- **1.** By the sound they emit into space — **← Mova's choice** · score 3
- **2.** By direct observation of their black surface — no support
- **3.** By their effects on nearby stars and gas — **✓ the right answer** · no support
- **4.** By the light they reflect from the Sun — no support

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 3, the only option with support. Its support: lesson 25, line 6: «A black hole is a place where so much mass is squeezed into a small space that its gravity lets nothing, not even light, escape.», reached through the same lesson line as the sentence the question matched. What matched: the same doer «place» (+2); the same place «small space» (+2). Against it: a different action (counts against) (-1). 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/space/25-black-holes/e4/)

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- ← previous: [24. Galaxies and the Big Bang](https://md.mova.elamur.ai/free/en/school-run/space/24-galaxies-and-the-big-bang/)
- next →: [26. Exoplanets and the search for life](https://md.mova.elamur.ai/free/en/school-run/space/26-exoplanets-and-the-search-for-life/)
- ↑ back to [Space](https://md.mova.elamur.ai/free/en/school-run/space/)