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The Secret of the Ninth Planet
The Secret of the Ninth Planet

Chapter IV · _The Secret of A-G 17_

Chapter IV of The Secret of the Ninth Planet, “_The Secret of A-G 17_,” is here in full — 145 sentences across 29 reading sections, with audio for every sentence and word.

Cover illustration for The Secret of the Ninth Planet
Context Illustration Reading 1/29 · 5 lines
English subtitles · tap any word to listen 1 / 5
The Dennings did not have much time to speculate on the mystery of the Sun-stealers.
For just as they were discussing what should be their next course of action, the problem was solved for them.
There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.
"They're U.S. planes!" gasped Burl, jumping to his feet and going to meet them.
"It must mean that they know we stopped the machines."
0:00 / 0:00
Speed 0.75x
AI-generated narration by OpenAI · Slow US English
LEARNER DICTIONARY
Archivist
/ˈɑːrkɪvɪst/
Editorial verification pending

A keeper or guardian of historical records and memories.

The Secret of the Ninth Planet

Chapter IV · _The Secret of A-G 17_

Chapter IV of The Secret of the Ninth Planet, “_The Secret of A-G 17_,” is here in full — 145 sentences across 29 reading sections, with audio for every sentence and word.

Reading 1/29 · 5 reading units · Lines 1–5

Line 1
The Dennings did not have much time to speculate on the mystery of the Sun-stealers.
Line 2
For just as they were discussing what should be their next course of action, the problem was solved for them.
/fɔːr dʒʌst æz ðeɪ wɜːr dɪˈskʌsɪŋ wʌt ʃʊd biː ðer nekst kɔːrs ʌv ˈækʃən ðə ˈprɑːbləm wɑːz sɑːlvd fɔːr ðem/
Line 3
There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.
/ðer wɑːz ə ˈrɔːrɪŋ ɪn ðə er ðen ə ˈhʌmɪŋ ənd ɪn ə ˈmætər ʌv ə fjuː mɔːr ˈsekəndz sɪks ˈrɑːkət ˈhelɪkɑːptərz pɑːpt ˈɪntuː saɪt ˈhʌvərd ˈoʊvər ðə ˈvæli ɑːn ˈstriːmɪŋ dʒets ənd ˈsetəld daʊn/
Line 4
"They're U.S. planes!" gasped Burl, jumping to his feet and going to meet them.
Line 5
"It must mean that they know we stopped the machines."
/ɪt mʌst miːn ðæt ðeɪ noʊ wiː stɑːpt ðə məˈʃiːnz/

Learner Dictionary

These definitions explain words found in the current reading and keep every example grounded in its original sentence.

Oxford-style entry order: headword, part of speech, US IPA, concise definition, contextual example, and audio.

Burl noun US /bɜːrl/

the wood cut from a tree burl or outgrowth; often used decoratively in veneer

From this reading “"They're U.S. planes!" gasped Burl, jumping to his feet and going to meet them.”

helicopters noun US /ˈhelɪkɑːptərz/

plural of “helicopter” — an aircraft without wings that obtains its lift from the rotation of overhead blades

From this reading “There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.”

jets noun US /dʒets/

plural of “jet” — an airplane powered by one or more jet engines

From this reading “There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.”

planes noun US /pleɪnz/

plural of “plane” — an aircraft that has a fixed wing and is powered by propellers or jets

From this reading “"They're U.S. planes!" gasped Burl, jumping to his feet and going to meet them.”

popped verb US /pɑːpt/

inflected form of “pop” — bulge outward

From this reading “There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.”

rocket noun US /ˈrɑːkət/

any vehicle self-propelled by a rocket engine

From this reading “There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.”

solved adjective US /sɑːlvd/

explained or answered

From this reading “For just as they were discussing what should be their next course of action, the problem was solved for them.”

speculate verb US /ˈspekjəleɪt/

to believe especially on uncertain or tentative grounds

From this reading “The Dennings did not have much time to speculate on the mystery of the Sun-stealers.”

Word partnerships in these lines

English keeps certain words together, and knowing the pair is worth more than knowing each word alone. Every partnership below was counted across our whole published library, and earns its place by appearing far more often than two unrelated words of the same frequency would.

Shown as this reading writes them, with the form the library counts, what kind of pairing it is, and how often it occurs.

hovered over verb + particle counted as “hover over”

In this reading “There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.”

speculate on verb + particle

In this reading “The Dennings did not have much time to speculate on the mystery of the Sun-stealers.”

popped into verb + particle counted as “pop into”

In this reading “There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.”

in the air preposition + article + noun counted as “in … air”

on everybody's mind

In this reading “There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.”

into sight preposition + noun

In this reading “There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.”

in a matter preposition + article + noun counted as “in … matter”

In this reading “There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.”

All words in this reading · 74

Every word in these five lines is listed here, and every one of them can be played on its own.

Dictionary details are shown only when verified; these are not licensed Oxford entries.

adeterminerUS /ə/

used before a singular noun to mean one of a group, when it is not a particular one

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

actionnounUS /ˈækʃən/

something done (usually as opposed to something said)

From this reading For just as they were discussing what should be their next course of action, the problem was solved for them.

airnounUS /er/

a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

andconjunctionUS /ənd/

used to join words or parts of a sentence that go together

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

asconjunctionUS /æz/

at the same time that; because; in the way that

From this reading For just as they were discussing what should be their next course of action, the problem was solved for them.

beauxiliary verbUS /biː/

used with a past participle to form the passive, or with -ing for continuous tenses

From this reading For just as they were discussing what should be their next course of action, the problem was solved for them.

BurlnounUS /bɜːrl/

the wood cut from a tree burl or outgrowth; often used decoratively in veneer

From this reading "They're U.S. planes!" gasped Burl, jumping to his feet and going to meet them.

coursenounUS /kɔːrs/

education imparted in a series of lessons or meetings

From this reading For just as they were discussing what should be their next course of action, the problem was solved for them.

Dennings

Dictionary entry pending editorial verification. Tap Listen to hear the word.

From this reading The Dennings did not have much time to speculate on the mystery of the Sun-stealers.

didauxiliary verbUS /dɪd/

the past form of “do”, used in questions and negatives

From this reading The Dennings did not have much time to speculate on the mystery of the Sun-stealers.

discussingverbUS /dɪˈskʌsɪŋ/

-ing form of “discuss” — to consider or examine in speech or writing

From this reading For just as they were discussing what should be their next course of action, the problem was solved for them.

downadjectiveUS /daʊn/

being or moving lower in position or less in some value

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

feetnounUS /fiːt/

plural of “foot” — the part of the leg of a human being below the ankle joint

From this reading "They're U.S. planes!" gasped Burl, jumping to his feet and going to meet them.

fewadjectiveUS /fjuː/

a quantifier that can be used with count nouns and is often preceded by “a”; a small but indefinite number

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

ForprepositionUS /fɔːr/

intended to be given to, or used by, somebody

From this reading For just as they were discussing what should be their next course of action, the problem was solved for them.

gaspedverbUS /ɡæspt/

past form of “gasp” — breathe noisily, as when one is exhausted

From this reading "They're U.S. planes!" gasped Burl, jumping to his feet and going to meet them.

goingnounUS /ˈɡoʊɪŋ/

the act of departing

From this reading "They're U.S. planes!" gasped Burl, jumping to his feet and going to meet them.

haveauxiliary verbUS /hæv/

used with a past participle to form the perfect tenses

From this reading The Dennings did not have much time to speculate on the mystery of the Sun-stealers.

helicoptersnounUS /ˈhelɪkɑːptərz/

plural of “helicopter” — an aircraft without wings that obtains its lift from the rotation of overhead blades

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

hisdeterminerUS /hɪz/

belonging to a man, boy, or male animal already mentioned

From this reading "They're U.S. planes!" gasped Burl, jumping to his feet and going to meet them.

hoveredverbUS /ˈhʌvərd/

past form of “hover” — be undecided about something; waver between conflicting positions or courses of action

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

hummingnounUS /ˈhʌmɪŋ/

a humming noise

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

inprepositionUS /ɪn/

inside something, or within a place, period, or state

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

intoprepositionUS /ˈɪntuː/

moving to the inside of something

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

ItpronounUS /ɪt/

a thing, animal, or idea already mentioned

From this reading "It must mean that they know we stopped the machines."

jetsnounUS /dʒets/

plural of “jet” — an airplane powered by one or more jet engines

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

jumpingnounUS /ˈdʒʌmpɪŋ/

the act of participating in an athletic competition in which you must jump

From this reading "They're U.S. planes!" gasped Burl, jumping to his feet and going to meet them.

justadverbUS /dʒʌst/

and nothing more

From this reading For just as they were discussing what should be their next course of action, the problem was solved for them.

knowverbUS /noʊ/

be cognizant or aware of a fact or a specific piece of information; possess knowledge or information about

From this reading "It must mean that they know we stopped the machines."

machinesnounUS /məˈʃiːnz/

plural of “machine” — any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks

From this reading "It must mean that they know we stopped the machines."

matternounUS /ˈmætər/

a vaguely specified concern

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

meanverbUS /miːn/

mean or intend to express or convey

From this reading "It must mean that they know we stopped the machines."

meetverbUS /miːt/

come together

From this reading "They're U.S. planes!" gasped Burl, jumping to his feet and going to meet them.

moreadjectiveUS /mɔːr/

(comparative of “much” used with mass nouns) a quantifier meaning greater in size or amount or extent or degree

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

muchadverbUS /mʌtʃ/

to a great degree or extent

From this reading The Dennings did not have much time to speculate on the mystery of the Sun-stealers.

mustmodal verbUS /mʌst/

used to say something is necessary, or almost certainly true

From this reading "It must mean that they know we stopped the machines."

mysterynounUS /ˈmɪstəri/

something that baffles understanding and cannot be explained

From this reading The Dennings did not have much time to speculate on the mystery of the Sun-stealers.

nextadjectiveUS /nekst/

immediately following in time or order

From this reading For just as they were discussing what should be their next course of action, the problem was solved for them.

notadverbUS /nɑːt/

used to make a word, phrase, or sentence negative

From this reading The Dennings did not have much time to speculate on the mystery of the Sun-stealers.

ofprepositionUS /ʌv/

belonging to, or connected with, somebody or something

From this reading The Dennings did not have much time to speculate on the mystery of the Sun-stealers.

onprepositionUS /ɑːn/

touching and supported by a surface

From this reading The Dennings did not have much time to speculate on the mystery of the Sun-stealers.

overprepositionUS /ˈoʊvər/

above and across; more than

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

planesnounUS /pleɪnz/

plural of “plane” — an aircraft that has a fixed wing and is powered by propellers or jets

From this reading "They're U.S. planes!" gasped Burl, jumping to his feet and going to meet them.

poppedverbUS /pɑːpt/

inflected form of “pop” — bulge outward

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

problemnounUS /ˈprɑːbləm/

a state of difficulty that needs to be resolved

From this reading For just as they were discussing what should be their next course of action, the problem was solved for them.

roaringnounUS /ˈrɔːrɪŋ/

a deep prolonged loud noise

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

rocketnounUS /ˈrɑːkət/

any vehicle self-propelled by a rocket engine

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

SnounUS /es/

1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites

From this reading "They're U.S. planes!" gasped Burl, jumping to his feet and going to meet them.

secondsnounUS /ˈsekəndz/

plural of “second” — 1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

settledadjectiveUS /ˈsetəld/

established or decided beyond dispute or doubt

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

shouldmodal verbUS /ʃʊd/

used to say what is right, expected, or advisable

From this reading For just as they were discussing what should be their next course of action, the problem was solved for them.

sightnounUS /saɪt/

an instance of visual perception

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

sixnounUS /sɪks/

the cardinal number that is the sum of five and one

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

solvedadjectiveUS /sɑːlvd/

explained or answered

From this reading For just as they were discussing what should be their next course of action, the problem was solved for them.

speculateverbUS /ˈspekjəleɪt/

to believe especially on uncertain or tentative grounds

From this reading The Dennings did not have much time to speculate on the mystery of the Sun-stealers.

stoppedadjectiveUS /stɑːpt/

(of a nose) blocked

From this reading "It must mean that they know we stopped the machines."

streamingadjectiveUS /ˈstriːmɪŋ/

exuding a bodily fluid in profuse amounts

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

Sun-stealers

Dictionary entry pending editorial verification. Tap Listen to hear the word.

From this reading The Dennings did not have much time to speculate on the mystery of the Sun-stealers.

thatconjunctionUS /ðæt/

used to introduce what somebody said, thought, or felt

From this reading "It must mean that they know we stopped the machines."

ThedeterminerUS /ðə/

used before a noun that is already known, already mentioned, or the only one of its kind

From this reading The Dennings did not have much time to speculate on the mystery of the Sun-stealers.

theirdeterminerUS /ðer/

belonging to the people or things already mentioned

From this reading For just as they were discussing what should be their next course of action, the problem was solved for them.

thempronounUS /ðem/

the people or things already mentioned, as the object

From this reading For just as they were discussing what should be their next course of action, the problem was solved for them.

thenadverbUS /ðen/

subsequently or soon afterward (often used as sentence connectors)

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

ThereadverbUS /ðer/

in or at that place or location

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

theypronounUS /ðeɪ/

the people, animals, or things already mentioned, as the subject

From this reading For just as they were discussing what should be their next course of action, the problem was solved for them.

They're

Dictionary entry pending editorial verification. Tap Listen to hear the word.

From this reading "They're U.S. planes!" gasped Burl, jumping to his feet and going to meet them.

timenounUS /taɪm/

an instance or single occasion for some event

From this reading The Dennings did not have much time to speculate on the mystery of the Sun-stealers.

toparticleUS /tuː/

used before the base form of a verb to make the infinitive

From this reading The Dennings did not have much time to speculate on the mystery of the Sun-stealers.

UnounUS /juː/

a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine

From this reading "They're U.S. planes!" gasped Burl, jumping to his feet and going to meet them.

valleynounUS /ˈvæli/

a long depression in the surface of the land that usually contains a river

From this reading There was a roaring in the air, then a humming, and in a matter of a few more seconds, six rocket helicopters popped into sight, hovered over the valley on streaming jets, and settled down.

wasauxiliary verbUS /wɑːz/

the past form of “be” used with I, he, she, it, or a singular noun

From this reading For just as they were discussing what should be their next course of action, the problem was solved for them.

wepronounUS /wiː/

the speaker together with one or more other people

From this reading "It must mean that they know we stopped the machines."

wereauxiliary verbUS /wɜːr/

the past form of “be” used with you, we, they, or a plural noun

From this reading For just as they were discussing what should be their next course of action, the problem was solved for them.

whatpronounUS /wʌt/

used to ask for information about something

From this reading For just as they were discussing what should be their next course of action, the problem was solved for them.

Chapter 4 of The Secret of the Ninth Planet by Donald A. Wollheim holds 145 sentences, grouped into 29 reading sections of at most 5 sentences. The text is the source edition, unabridged, and the chapter records which sentences cover which part of the work so that nothing is dropped. Every word can be tapped for its pronunciation and dictionary entry.

What does chapter 4 of The Secret of the Ninth Planet contain?

Chapter 4 holds 145 sentences of The Secret of the Ninth Planet, unabridged, divided into 29 reading sections.

This page carries chapter 4 of The Secret of the Ninth Planet by Donald A. Wollheim exactly as it stands in the source edition, without abridgement. It runs to 145 sentences, grouped into 29 sections of at most 5 sentences so that a reader can take the chapter in steady, finishable pieces. The chapter also stores a coverage record mapping every one of its sentences to a part of the work, which is how the edition demonstrates that no line was dropped.

How do I study chapter 4 of The Secret of the Ninth Planet?

Work through the 29 sections in order, replaying any sentence and tapping unfamiliar words for their entries.

Each of the 29 sections in this chapter is short enough to read once, hear once, and then re-read with the vocabulary in view. Tapping a word plays it alone and opens its dictionary entry with IPA, part of speech and meaning, so the reader is never forced to guess a pronunciation from spelling. Working section by section keeps a long chapter from becoming an undifferentiated wall of text, which is the usual reason a reader abandons a work of this period.

Can chapter 4 be read aloud to me?

Yes — every sentence and every individual word in chapter 4 can be played aloud in United States English.

Audio covers the whole chapter: any sentence can be played, and any single word within it can be played on its own. The voice uses United States English. For a work of this period that matters, because spelling is an unreliable guide to pronunciation for vocabulary that has fallen out of daily use, and a learner who guesses wrong tends to keep the error. Hearing the word in its own sentence, and then alone, settles it.

Questions about reading The Secret of the Ninth Planet

Common questions about reading The Secret of the Ninth Planet by Donald A. Wollheim on this page, its source edition and its audio.

Is this the complete text of The Secret of the Ninth Planet?

Yes. All 3287 sentences of Project Gutenberg eBook #33644 are kept, with a record of which sentences cover which part.

Which edition of The Secret of the Ninth Planet is used?

Project Gutenberg eBook #33644, unabridged. The Project Gutenberg header, footer and licence are removed.

How long does The Secret of the Ninth Planet take to read?

About 273 minutes of reading across 658 sections of 5 sentences each, at an unhurried pace.

How to read The Secret of the Ninth Planet section by section

How to work through The Secret of the Ninth Planet section by section, using the audio and the tap-to-define vocabulary.

  1. Open a chapter

    Choose one of the 20 chapters of The Secret of the Ninth Planet to begin.

  2. Read one section

    Each section holds 5 sentences; read it once through.

  3. Listen and tap

    Play the section aloud, then tap any unfamiliar word for its entry.

Vocabulary met early in The Secret of the Ninth Planet

Words and structures a reader meets early in The Secret of the Ninth Planet, each tappable for pronunciation and meaning.

Secret
A word that appears in the opening chapter of The Secret of the Ninth Planet; the reader can tap it to hear it and see its dictionary entry.
Ninth
A word that appears in the opening chapter of The Secret of the Ninth Planet; the reader can tap it to hear it and see its dictionary entry.
Planet
A word that appears in the opening chapter of The Secret of the Ninth Planet; the reader can tap it to hear it and see its dictionary entry.
Cecile
A word that appears in the opening chapter of The Secret of the Ninth Planet; the reader can tap it to hear it and see its dictionary entry.