Stars, planets and constellations in the night sky

Tests: 9 of 13 right · Exam: 3 of 4 right · Kind: plain · Understood: 15 of 17 · Run: 2026-10-18, commit f3c23ea72

Lesson 70 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.

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 ✓

You take a long-exposure photo (the camera stays open for hours) of the northern sky. The stars make circles. Which star is near the centre?

1. The Sun — score 2
2. The Southern Cross — no support
3. Venus — no support
4. Polaris, the North Star — ← Mova's choice · ✓ the right answer · score 7

Why: It took the question to ask who or what does it. It chose option 4 with score 7, against 2 for the next best. Its support: lesson 70, line 9: «Polaris, the North Star, stays almost still in the sky, and the other stars seem to circle around it.», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+4); the same doer «other stars» (+3). · the question and its options parsed, with trees and pragmatics

Test 2 · wrong ✗

Two stars look side by side in the same constellation. Which is true?

1. They must be the same size — no support
2. They must be touching each other — no support
3. They must be exactly the same distance away from us — ← Mova's choice · score 5
4. One may be much farther from us than the other — ✓ the right answer · 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 70, line 10: «The stars of a constellation are usually at very different distances from us.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «stars» (+2); the same circumstance (+2); the same light verb (be, have, do, get, go) (+1). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 3 · right ✓

A bright point does not twinkle and has moved compared with the stars since last month. What is it probably?

1. A planet — ← Mova's choice · ✓ the right answer · no support
2. A shooting star — no support
3. A very young star — no support
4. A distant galaxy — 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 ✗

A friend makes a wish on a shooting star. What did she really see?

1. A tiny piece of space rock burning up — ✓ the right answer · no support
2. A star falling all the way to the Earth — ← Mova's choice · score 5
3. The reflected light of a far-away planet — no support
4. A brand new star being born in the sky — no support

Why: It took the question to ask who or what does it. It chose option 2 with score 5, the only option with support. Its support: lesson 70, line 2: «The stars seem to move slowly across the sky during the night, rising in the east and setting in the west, but it is really the Earth turning, just as it makes…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+4); the same doer «stars» (+3). 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

Test 5 · right ✓

If the Earth stopped turning, what would happen to the stars in the night sky?

1. They would all disappear — no support
2. They would stop rising and setting — ← Mova's choice · ✓ the right answer · score 8
3. They would all fall down to the ground — no support
4. They would spin twice as fast — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 8, the only option with support. Its support: lesson 70, line 2: «The stars seem to move slowly across the sky during the night, rising in the east and setting in the west, but it is really the Earth turning, just as it makes…», reached through the same lesson line as the sentence the question matched. What matched: the same action «rise» (+4); the same doer «stars» (+4). · the question and its options parsed, with trees and pragmatics

Test 6 · right ✓

In a big city at night you see only a handful of stars. What is the best reason?

1. The tall buildings block every one of them — no support
2. The city lights make the sky too bright — ← Mova's choice · ✓ the right answer · score 3
3. The air above a city has no stars — score 3
4. The warm city air blocks starlight — no support

Why: It took the question to ask what it is done to. It chose option 2 with score 3, tied with another option at 3 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 60, line 5: «In a thunderstorm the light of the lightning reaches you almost at once, but the sound of thunder travels about one kilometre in three seconds — so counting th…», reached through the option's own match among the sentences about the question's things. What matched: the same action «reach» (+2); the same doer «light» (+2). Against it: a different thing acted on (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 7 · right ✓

Which is true about the stars during the day?

1. They all hide behind the Sun — score 3
2. They move under the ground until night comes again — score 3
3. They switch off until evening — no support
4. They are still there, but the sunlight hides them — ← Mova's choice · ✓ the right answer · score 10

Why: It took the question to ask which statement is true. It chose option 4 with score 10, against 3 for the next best. Its support: lesson 1, line 14: «The stars are in the sky during the day too, but the bright sunlight hides them.», reached through the same lesson line as the sentence the question matched. What matched: the same action «hide» (+4); the same doer «bright sunlight» (+4); the same thing acted on «stars» (+2). · the question and its options parsed, with trees and pragmatics

Test 8 · wrong ✗

Why would a traveller from Ukraine notice new constellations in South Africa?

1. South Africa has its own separate stars — ← Mova's choice · no support
2. The stars change on every continent — no support
3. Part of the southern sky cannot be seen from the far north — ✓ the right answer · no support
4. The sky is closer to the ground in Africa — 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 ✗

An astronaut on the Moon, with no air around, looks at the stars. What does she notice?

1. The stars do not twinkle — ✓ the right answer · score 1
2. There are no stars at all — no support
3. The stars twinkle much more — ← Mova's choice · score 4
4. The stars are all red — score 4

Why: It took the question to ask what it is done to. It chose option 3 with score 4, tied with another option at 4 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 70, line 13: «Stars twinkle because moving air bends their light this way and that; planets usually shine more steadily.», reached through the option's own match among the sentences about the question's things. What matched: the same action «twinkle» (+2); the same doer «stars» (+2). The right option, 1, scored 1. · the question and its options parsed, with trees and pragmatics

Test 10 · right ✓

why's the north star always in the same spot

1. Polaris is the closest star and does not move — score 4
2. Polaris moves, but too fast for us to see — score 5
3. Polaris is a planet and so it never moves — score 0
4. Polaris stays almost still, and the other stars seem to circle round it — ← Mova's choice · ✓ the right answer · score 8

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 70, line 8: «The stars seem to move across the sky at night because the Earth turns.», reached through the same lesson line as the sentence the question matched. What matched: the same action «seem» (+4); the same doer «stars» (+4). · the question and its options parsed, with trees and pragmatics

Test 11 · right ✓

where do the stars go in the daytime

1. They move to the other side of the Sun — score 5
2. They are still there, but the bright sky hides them — ← Mova's choice · ✓ the right answer · score 10
3. They go out in the morning and light up again at night — score 5
4. They hide behind the Moon until dark — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 10, against 5 for the next best. Its support: lesson 70, line 18: «The stars are still in the sky during the day, but the bright sunlit sky hides them.», reached through the same lesson line as the sentence the question matched. What matched: the same action «hide» (+4); the same doer «bright sunlit sky» (+4); the same thing acted on «stars» (+2). · the question and its options parsed, with trees and pragmatics

Test 12 · right ✓

Ava says a shooting star is a star falling down. true?

1. Yes, it is a small star dropping out of the sky — score 4
2. No, it is a speck of space rock burning up in the air — ← Mova's choice · ✓ the right answer · score 10
3. No, it is a planet moving very fast — no support
4. Yes, but it burns out before it reaches us — score 3

Why: It took the question to ask which statement is true. It chose option 2 with score 10, against 4 for the next best. Its support: lesson 70, line 17: «A shooting star is not a star but a meteor: a speck of space rock burning up in the air.», reached through the same lesson line as the sentence the question matched. What matched: the same action «burn up» (+4); the same doer «speck» (+4); the same place «air» (+2). · the question and its options parsed, with trees and pragmatics

Test 13 · right ✓

my sister reckons the stars in a constellation are all close together. right?

1. No, they are usually at very different distances from us — ← Mova's choice · ✓ the right answer · score 7
2. Yes, they sit side by side in a small group, close together — score 3
3. Yes, they are held together by a cloud of gas — no support
4. No, they are all at exactly the same distance — score 5

Why: It took the question to ask which statement is true. It chose option 1 with score 7, against 5 for the next best. Its support: lesson 70, line 10: «The stars of a constellation are usually at very different distances from us.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «stars» (+2); the same property (+2); the same circumstance (+2); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Identify the principal reason for which the stars appear to move across the sky at night.

1. The wind in the upper atmosphere — no support
2. The rotation of the Earth — ✓ the right answer · no support
3. The motion of the Moon across the sky — ← Mova's choice · score 3
4. The motion of the stars around the Sun — no support

Why: It took the question to ask which statement is true. It chose option 3 with score 3, the only option with support. Its support: lesson 8, line 14: «The Sun is about 400 times wider than the Moon and about 400 times farther away, so they look almost the same size in the sky.», reached through the option's own match among the sentences about the question's things. What matched: the same doer «sun» (+2); the same place «sky» (+2). Against it: a different action (counts against) (-1). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · right ✓

Which of the following statements most accurately characterises a shooting star?

1. A speck of space rock burning in the air — ← Mova's choice · ✓ the right answer · score 12
2. A star falling towards the Earth — score 7
3. A satellite returning to the Earth — score 5
4. A planet passing in front of the Moon — score 7

Why: It took the question to ask who or what does it. It chose option 1 with score 12, against 7 for the next best. Its support: lesson 70, line 17: «A shooting star is not a star but a meteor: a speck of space rock burning up in the air.», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+4); the same action «burn up» (+3); the same doer «speck» (+3); the same place «air» (+2). · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · right ✓

Select the response that is consistent with the established facts concerning the stars during the daytime.

1. They are extinguished each morning and rekindled at night — no support
2. They remain in the sky but are concealed by the bright sunlit sky — ← Mova's choice · ✓ the right answer · score 6
3. They move to the opposite side of the Sun — score 3
4. They descend below the horizon all together — score 3

Why: It took the question to ask which statement is true. It chose option 2 with score 6, against 3 for the next best. Its support: lesson 70, line 18: «The stars are still in the sky during the day, but the bright sunlit sky hides them.», reached through the same lesson line as the sentence the question matched. What matched: the same doer «stars» (+4); the same place «sky» (+2). · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · right ✓

Ascertain the principal reason for which different constellations are seen in winter and in summer.

1. The stars change their shapes with the seasons — no support
2. The Earth travels around the Sun — ← Mova's choice · ✓ the right answer · score 5
3. The Moon conceals certain stars in summer — no support
4. The stars travel around the Earth — no support

Why: It took the question to ask which statement is true. It chose option 2 with score 5, the only option with support. Its support: lesson 70, line 14: «We see different constellations in winter and in summer because the Earth travels around the Sun.», reached through a sentence linked to the one the question matched. What matched: the same action «travel» (+3); the same doer «earth» (+2). · the question and its options parsed, with trees and pragmatics

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/world/70-the-night-sky/