---
title: When a star like the Sun runs short of hydrogen in its core, it swel… — How stars die · tree and pragmatics
description: When a star like the Sun runs short of hydrogen in its core, it swells into a red giant hundreds of times wider than before. Who acts: star. A sentence of the lesson «How stars die» of the space course of Mova's primary school with its dependency tree and the pragmatics of every clause.
---

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# How stars die, sentence 5

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When a star like the Sun runs short of hydrogen in its core, it swells into a red giant hundreds of times wider than before.

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**Who acts:** star · **What happens:** run, swell · **To what, where:** core, red giant, hundreds

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This is a sentence of the lesson «How stars die» of the space course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (star), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:space:019-how-stars-die.lesson:5
# text = When a star like the Sun runs short of hydrogen in its core, it swells into a red giant hundreds of times wider than before.
# source = school lesson (ours)
# course = space
# lesson = 019-how-stars-die.lesson
# annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R5-strong ×4
1	When	when	ADV	WRB	PronType=Int	7	advmod	_	_
2	a	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	_
3	star	star	NOUN	NN	Number=Sing	7	nsubj	_	_
4	like	like	ADP	IN	_	6	case	_	_
5	the	the	DET	DT	Definite=Def|PronType=Art	6	det	_	_
6	Sun	Sun	PROPN	NNP	Number=Sing	3	nmod	_	_
7	runs	run	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	16	advcl	_	_
8	short	short	ADJ	JJ	Degree=Pos	7	xcomp	_	_
9	of	of	ADP	IN	_	10	case	_	_
10	hydrogen	hydrogen	NOUN	NN	Number=Sing	8	obl	_	Agree=R5-strong|Haiku=7:obl
11	in	in	ADP	IN	_	13	case	_	_
12	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	13	nmod:poss	_	_
13	core	core	NOUN	NN	Number=Sing	7	obl	_	_
14	,	,	PUNCT	,	_	7	punct	_	_
15	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	16	nsubj	_	_
16	swells	swell	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
17	into	into	ADP	IN	_	21	case	_	_
18	a	a	DET	DT	Definite=Ind|PronType=Art	20	det	_	Agree=R5-strong|Haiku=21:det
19	red	red	ADJ	JJ	Degree=Pos	20	amod	_	Agree=R5-strong|Haiku=21:amod
20	giant	giant	NOUN	NN	Number=Sing	16	obl	_	Agree=R5-strong|Haiku=21:amod|HaikuPos=ADJ:JJ:Degree=Pos
21	hundreds	hundred	NOUN	NNS	Number=Plur	16	obl	_	_
22	of	of	ADP	IN	_	23	case	_	_
23	times	time	NOUN	NNS	Number=Plur	24	obl:unmarked	_	_
24	wider	wide	ADJ	JJR	Degree=Cmp	21	amod	_	_
25	than	than	ADP	IN	_	26	case	_	_
26	before	before	ADV	RB	_	24	obl	_	_
27	.	.	PUNCT	.	_	16	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- .note -->
No stored speech act for this sentence.

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| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **run** | present | a star like the Sun |  |  | star's core |  | short *property* | vn run-51.3.2-2-1 «NP V PP.location»: agent=Theme in core=Trajectory |
| 2 | **swell** | present | star | a red giant |  | hundreds |  |  | vn calibratable\_cos-45.6.1-1 «NP.attribute V»: agent=Attribute |

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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.

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**Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:space:019-how-stars-die.lesson:5`.

**The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R5-strong ×4. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence.

See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/).

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