---
title: Two Cepheids pulse equally slowly, but one looks much dimmer. What c… — How we know: measuring the sky · tree and pragmatics
description: Two Cepheids pulse equally slowly, but one looks much dimmer. What can you conclude? Test 6 · ★★★ of lesson 28 «How we know: measuring the sky» of the space course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was wrong.
---

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# Test 6 · ★★★ · How we know: measuring the sky

<!-- .ven lang=en -->
Two Cepheids pulse equally slowly, but one looks much dimmer. What can you conclude?

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 3 · wrong ✗ · **Who acts:** Two Cepheids, one, you · **What happens:** pulse, look, conclude

<!-- .vabout -->
This is test 6 · ★★★ of lesson 28 «How we know: measuring the sky» of the space course of Mova's primary school. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: [the test at school](https://md.mova.elamur.ai/free/en/school-run/space/28-how-we-know-measuring-the-sky/#t6).

## The question {#question}

<!-- .note -->
*Sentence 1:* Two Cepheids pulse equally slowly, but one looks much dimmer.

```conllu
# sent_id = question:space:28-how-we-know-measuring-the-sky:t6:1
# text = Two Cepheids pulse equally slowly, but one looks much dimmer.
1	Two	two	NUM	CD	NumForm=Word|NumType=Card	2	nummod	_	_
2	Cepheids	cepheid	NOUN	NNS	Number=Plur	3	nsubj	_	_
3	pulse	pulse	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
4	equally	equally	ADV	RB	_	5	advmod	_	_
5	slowly	slowly	ADV	RB	_	3	advmod	_	SpaceAfter=No
6	,	,	PUNCT	,	_	9	punct	_	_
7	but	but	CCONJ	CC	_	9	cc	_	_
8	one	one	PRON	PRP	Number=Sing|Person=3|PronType=Prs	9	nsubj	_	_
9	looks	look	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	parataxis	_	_
10	much	much	ADV	RB	_	11	advmod	_	_
11	dimmer	dim	ADJ	JJR	Degree=Cmp	9	xcomp	_	SpaceAfter=No
12	.	.	PUNCT	.	_	3	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **pulse** | present | Two Cepheids |  |  |  |  | slowly *property* | vn modes\_of\_being\_with\_motion-47.3 «NP V»: agent=Theme |
| 2 | **look** | present | one |  |  |  |  | dim *property* | vn stimulus\_subject-30.4 «NP V ADJ»: agent=Stimulus |

<!-- .note -->
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

<!-- .note -->
*Sentence 2:* What can you conclude?

```conllu
# sent_id = question:space:28-how-we-know-measuring-the-sky:t6:2
# text = What can you conclude?
1	What	what	PRON	WP	PronType=Int	4	obj	_	_
2	can	can	AUX	MD	VerbForm=Fin	4	aux	_	_
3	you	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	4	nsubj	_	_
4	conclude	conclude	VERB	VB	VerbForm=Inf	0	root	_	SpaceAfter=No
5	?	?	PUNCT	.	_	4	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **conclude** | can | you |  |  |  |  |  | vn deduce-97.2 «NP V NP»: agent=Agent what=Theme |

## The options {#options}

### Option 1 · ← Mova's choice {#o1}

<!-- .ven lang=en -->
They must be the same distance

```conllu
# sent_id = question:space:28-how-we-know-measuring-the-sky:t6:o1:1
# text = They must be the same distance
1	They	they	PRON	PRP	Case=Nom|Number=Plur|Person=3|PronType=Prs	6	nsubj	_	_
2	must	must	AUX	MD	VerbForm=Fin	6	aux	_	_
3	be	be	AUX	VB	VerbForm=Inf	6	cop	_	_
4	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
5	same	same	ADJ	JJ	Degree=Pos	6	amod	_	_
6	distance	distance	NOUN	NN	Number=Sing	0	root	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | must | They | the same distance |  |  |  |  | tree rules |

### Option 2 {#o2}

<!-- .ven lang=en -->
The dimmer one is younger

```conllu
# sent_id = question:space:28-how-we-know-measuring-the-sky:t6:o2:1
# text = The dimmer one is younger
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	dimmer	dim	ADJ	JJR	Degree=Cmp	3	amod	_	_
3	one	one	NOUN	NN	Number=Sing	5	nsubj	_	_
4	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	5	cop	_	_
5	younger	young	ADJ	JJR	Degree=Cmp	0	root	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | the dimmer one |  |  |  |  | young *property* | tree rules |

### Option 3 · ✓ the right answer {#o3}

<!-- .ven lang=en -->
The dimmer one is much farther away

```conllu
# sent_id = question:space:28-how-we-know-measuring-the-sky:t6:o3:1
# text = The dimmer one is much farther away
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	dimmer	dim	ADJ	JJR	Degree=Cmp	3	amod	_	_
3	one	one	NOUN	NN	Number=Sing	0	root	_	_
4	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	cop	_	_
5	much	much	ADV	RB	_	6	advmod	_	_
6	farther	far	ADV	RBR	Degree=Cmp	3	conj	_	_
7	away	away	ADV	RB	_	6	advmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present |  |  |  |  |  | away, far *property* | tree rules |

### Option 4 {#o4}

<!-- .ven lang=en -->
The dimmer one is much nearer

```conllu
# sent_id = question:space:28-how-we-know-measuring-the-sky:t6:o4:1
# text = The dimmer one is much nearer
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	dimmer	dim	ADJ	JJR	Degree=Cmp	3	amod	_	_
3	one	one	NOUN	NN	Number=Sing	6	nsubj	_	_
4	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	cop	_	_
5	much	much	ADV	RB	_	6	advmod	_	_
6	nearer	near	ADJ	JJR	Degree=Cmp	0	root	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | the dimmer one |  |  |  |  | near *property* | tree rules |

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**Text:** the tests of Mova's primary school, written for Mova (`world/data/school/`), as the course runner gave them to the student. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each text read on its own. Elamur Cosmic License.

<!-- /div -->

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- ← previous: [How we know: measuring the sky, test 5](https://md.mova.elamur.ai/free/en/corpora/questions/space/28-how-we-know-measuring-the-sky/t5/)
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