Asteroids and the asteroid belt

Tests: 6 of 11 right · Exam: 1 of 4 right · Kind: ★★ · Understood: 8 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 9 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 ✓

In a film, a spaceship swerves through an asteroid belt packed with tumbling rocks. What is the truth?

1. The belt is a solid ring of rock — no support
2. Ships cannot fly through it at all — no support
3. Films are right, the rocks are touching — no support
4. The belt is mostly empty; asteroids are usually very far apart — ← Mova's choice · ✓ the right answer · score 7

Why: It took the question to ask which statement is true. It chose option 4 with score 7, the only option with support. Its support: lesson 9, line 2: «Most of them circle the Sun in the asteroid belt between Mars and Jupiter, but it is not like the crowded rock fields of films: the belt is so empty that space…», reached through the remembered sentence the question matched. What matched: the same doer «belt» (+4); the same light verb (be, have, do, get, go) (+2); the same property (+1). · the question and its options parsed, with trees and pragmatics

Test 2 · ★★ · right ✓

my bro says the belt is a smashed planet. what do scientists think?

1. It is pieces of the Moon — no support
2. It is leftover material that never joined into a planet — ← Mova's choice · ✓ the right answer · score 0
3. It is ice from Saturn's rings — no support
4. He is right, a whole planet exploded there a long time ago — no support

Why: It took the question to ask what it is done to. It chose option 2 with score 0, the only option with support. Its support: lesson 9, line 3: «All the belt's asteroids together weigh only about 3 percent of our Moon; Jupiter's strong pull stopped them ever joining into a planet.», reached through the option's own match among the sentences about the question's things. What matched: the same action «join» (+2); the same circumstance (+2). Against it: a different doer (counts against) (-1); one says «not», the other does not (counts against) (-3). · the question and its options parsed, with trees and pragmatics

Test 3 · ★★ · wrong ✗

Why did the asteroid belt never form a planet?

1. A planet did form there but was later eaten up by Mars — ← Mova's choice · score 6
2. The Sun burnt the rocks before they joined — no support
3. The asteroids repel each other like magnets — no support
4. Jupiter's strong gravity kept stirring it up — ✓ the right answer · no support

Why: It took the question to ask why something happens (its cause). It chose option 1 with score 6, the only option with support. Its support: lesson 9, line 1: «Asteroids are the leftover building blocks from when the planets formed, lumps of rock and metal from pebble size up to hundreds of kilometres across.», reached through the option's own match among the sentences about the question's things. What matched: the same action «form» (+3); the same doer «planets» (+3). The right option, 4, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 4 · ★★ · right ✓

You find a heavy black stone that fell from the sky. What should you call it?

1. A meteorite — ← Mova's choice · ✓ the right answer · no support
2. A meteoroid — no support
3. A comet — no support
4. A meteor — 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 5 · ★★ · wrong ✗

Lots of shooting stars tonight! What are they really?

1. Aeroplanes and satellites with bright flashing lights — ← Mova's choice · no support
2. Little pieces of the Moon breaking off and falling to us — no support
3. Real stars falling right out of the sky and going out — no support
4. Meteors, small space rocks burning up in our air — ✓ 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 6 · ★★ · right ✓

If astronomers spotted an asteroid heading for Earth years ahead, what could be tried?

1. Waiting for the Moon to catch it — no support
2. Hitting it with a spacecraft to nudge its orbit, as DART tested — ← Mova's choice · ✓ the right answer · score 8
3. Shouting a warning so it turns away — no support
4. Nothing can ever be done — no support

Why: It took the question to ask what it is done to. It chose option 2 with score 8, the only option with support. Its support: lesson 9, line 4: «A few asteroids cross the Earth's path, so astronomers track them, and in 2022 NASA's DART spacecraft even knocked a small one onto a new path as a test of def…», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+6); the same thing acted on «asteroids» (+4). Against it: a different action (counts against) (-2). · the question and its options parsed, with trees and pragmatics

Test 7 · ★★ · right ✓

Why do scientists want samples from asteroids like Bennu?

1. They are almost unchanged leftovers from the birth of the Solar System — ← Mova's choice · ✓ the right answer · score 4
2. They contain living creatures — no support
3. They will make the Earth bigger — no support
4. They are made of melted planets — no support

Why: It took the question to ask why something happens (its cause). It chose option 1 with score 4, the only option with support. Its support: lesson 9, line 6: «Asteroids are rocky or metallic leftovers from the birth of the Solar System, ranging from pebbles to hundreds of kilometres across.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «rocky leftovers» (+2); the same place «birth» (+2); the same light verb (be, have, do, get, go) (+1). Against it: a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 8 · ★★ · wrong ✗

A dinosaur game says all dinosaurs died out. What is the better answer?

1. All died, birds came from fish — ← Mova's choice · no support
2. Crocodiles are the last dinosaurs — no support
3. Some big dinosaurs still live in jungles — no support
4. Birds survived and are living dinosaurs — ✓ 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 9 · ★★ · wrong ✗

Grace adds up all the belt's asteroids and expects a planet bigger than the Earth. What would she really get?

1. A planet bigger than Jupiter — ← Mova's choice · score 10
2. Much less than our Moon, only about 3 percent of its mass — ✓ the right answer · score 2
3. About two Moons — no support
4. Exactly one Earth — no support

Why: It took the question to ask what it is done to. It chose option 1 with score 10, against 2 for the next best. Its support: lesson 5, line 7: «The Earth is the only place in the universe where we know life exists, and the only planet known to have liquid water oceans on its surface.», reached through the remembered sentence the question matched. What matched: it fills the role the question asks for (+6); the same thing acted on «only planet» (+4). The right option, 2, scored 2. · the question and its options parsed, with trees and pragmatics

Test 10 · ★★ · wrong ✗

Why is Ceres no longer called just an asteroid?

1. It orbits the Earth — ← Mova's choice · no support
2. It is big and round enough to be classed as a dwarf planet — ✓ the right answer · no support
3. It is made of ice and has a tail — no support
4. It has a ring and two moons — 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 11 · ★★ · right ✓

ugh another asteroid is gonna kill us all next week says the news. what's the real story?

1. Astronomers track tens of thousands of near-Earth objects; a scary headline is not the same as a real threat — ← Mova's choice · ✓ the right answer · score 6
2. Yes, one hits every week — no support
3. Nobody watches for asteroids — no support
4. Asteroids never come near the Earth — no support

Why: It took the question to ask which statement is true. It chose option 1 with score 6, the only option with support. Its support: lesson 9, line 14: «Some asteroids cross the Earth's orbit, and astronomers track tens of thousands of these near-Earth objects to check whether any could hit us.», reached through the same lesson line as the sentence the question matched. What matched: the same action «track» (+2); the same doer «astronomers» (+2); the same thing acted on «tens» (+2). · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Identify the region in which the greater number of known asteroids are found.

1. Within the orbit of Mercury — ← Mova's choice · no support
2. In the vicinity of the Moon — no support
3. Between the orbits of the Earth and Venus — no support
4. Between the orbits of Mars and Jupiter — ✓ 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

Exam question 2 · formal language · right ✓

Select the response consistent with the established facts concerning the Double Asteroid Redirection Test of 2022.

1. A spacecraft landed upon the dwarf planet Ceres — no support
2. A spacecraft returned samples from Bennu — no support
3. A spacecraft destroyed an asteroid that was approaching the Earth — no support
4. A spacecraft collided with Dimorphos and altered its orbit — ← 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, the only option with support. Its support: lesson 9, line 15: «In 2022 NASA's DART (Double Asteroid Redirection Test) spacecraft crashed into the small asteroid Dimorphos and changed its orbit, the first test of defending…», reached through the remembered sentence the question matched. What matched: the same doer «dart spacecraft» (+4); the same action «change» (+3); the same thing acted on «orbit» (+3). · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · wrong ✗

Which of the following statements most accurately characterises a meteorite?

1. An icy body possessing an extended tail — ← Mova's choice · no support
2. A fragment of extraterrestrial rock recovered upon the ground — ✓ the right answer · no support
3. The luminous trail produced in the upper atmosphere — no support
4. A small rocky body orbiting the Sun within the asteroid belt for ever — 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 ✗

Ascertain the aggregate mass of the asteroid belt relative to that of the Moon.

1. Approximately thirty times greater — ← Mova's choice · no support
2. Approximately equal thereto — no support
3. Approximately three per cent thereof — ✓ the right answer · no support
4. Approximately three hundred times greater — 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

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/space/9-asteroids-and-the-asteroid-belt/