---
title: Identify the element first discovered in the spectrum of the Sun in… — How we know: measuring the sky · tree and pragmatics
description: Identify the element first discovered in the spectrum of the Sun in 1868. Exam question 2 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 right.
---

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# Exam question 2 · How we know: measuring the sky

<!-- .ven lang=en -->
Identify the element first discovered in the spectrum of the Sun in 1868.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 1 · right ✓ · **Who acts:** you, element · **What happens:** identify, discover · **To what, where:** spectrum

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This is exam question 2 of lesson 28 «How we know: measuring the sky» of the space course of Mova's primary school, asked in stiff, formal language. 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/#e2).

## The question {#question}

```conllu
# sent_id = question:space:28-how-we-know-measuring-the-sky:e2:1
# text = Identify the element first discovered in the spectrum of the Sun in 1868.
1	Identify	identify	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	element	element	NOUN	NN	Number=Sing	5	nsubj	_	_
4	first	first	ADV	RB	NumForm=Word|NumType=Ord	5	advmod	_	_
5	discovered	discover	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	1	parataxis	_	_
6	in	in	ADP	IN	_	8	case	_	_
7	the	the	DET	DT	Definite=Def|PronType=Art	8	det	_	_
8	spectrum	spectrum	NOUN	NN	Number=Sing	5	obl	_	_
9	of	of	ADP	IN	_	11	case	_	_
10	the	the	DET	DT	Definite=Def|PronType=Art	11	det	_	_
11	Sun	Sun	PROPN	NNP	Number=Sing	8	nmod	_	_
12	in	in	ADP	IN	_	13	case	_	_
13	1868	1868	NUM	CD	NumForm=Digit|NumType=Card	5	obl	_	SpaceAfter=No
14	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **identify** | imperative | you *not said here* |  |  |  |  |  | vn empathize-88.2 «NP V»: agent=Experiencer |
| 2 | **discover** | past | the element |  |  | the spectrum of the Sun |  | in 1868; first *property* | vn discover-84-1 «NP V PP.topic S\_ING»: agent=Agent |

<!-- .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.

## The options {#options}

### Option 1 · ← Mova's choice · ✓ the right answer {#o1}

<!-- .ven lang=en -->
Helium

```conllu
# sent_id = question:space:28-how-we-know-measuring-the-sky:e2:o1:1
# text = Helium
1	Helium	helium	NOUN	NN	Number=Sing	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 2 {#o2}

<!-- .ven lang=en -->
Iron

```conllu
# sent_id = question:space:28-how-we-know-measuring-the-sky:e2:o2:1
# text = Iron
1	Iron	iron	NOUN	NN	Number=Sing	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 3 {#o3}

<!-- .ven lang=en -->
Hydrogen

```conllu
# sent_id = question:space:28-how-we-know-measuring-the-sky:e2:o3:1
# text = Hydrogen
1	Hydrogen	hydrogen	NOUN	NN	Number=Sing	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

### Option 4 {#o4}

<!-- .ven lang=en -->
Oxygen

```conllu
# sent_id = question:space:28-how-we-know-measuring-the-sky:e2:o4:1
# text = Oxygen
1	Oxygen	oxygen	NOUN	NN	Number=Sing	0	root	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

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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.

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