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cosmic background radiation: meaning, definition, pronunciation and examples

C2
UK/ˌkɒz.mɪk ˌbæk.ɡraʊnd ˌreɪ.diˈeɪ.ʃən/US/ˌkɑːz.mɪk ˌbæk.ɡraʊnd ˌreɪ.diˈeɪ.ʃən/

Academic, Technical, Scientific Journalism

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Quick answer

What does “cosmic background radiation” mean?

The faint, uniform, microwave radiation filling all of space, a remnant of the Big Bang.

Audio

Pronunciation

Definition

Meaning and Definition

The faint, uniform, microwave radiation filling all of space, a remnant of the Big Bang.

A foundational piece of evidence supporting the Big Bang theory, often seen as the 'afterglow' of the early universe's hot, dense state; its minute temperature fluctuations map the seeds of all cosmic structure.

Dialectal Variation

British vs American Usage

Differences

No significant differences in terminology or usage. Spelling follows national conventions (e.g., 'cosmic microwave background radiation' not 'cosmic microwave background radiation').

Connotations

Identical technical and scientific connotations in both varieties.

Frequency

Equal frequency in relevant academic/scientific discourse in both regions.

Grammar

How to Use “cosmic background radiation” in a Sentence

The cosmic background radiation + [verb: is, was discovered, provides evidence, shows fluctuations]Scientists + [verb: study, map, analyse, detect] + the cosmic background radiation[Adjective: primordial, relic, microwave] + background radiation

Vocabulary

Collocations

strong
cosmic microwave background radiationdetect cosmic background radiationmap of the cosmic background radiationtemperature of the cosmic background radiationanisotropy in the cosmic background radiationrelic radiationBig Bang remnant
medium
measurements of the cosmic background radiationfluctuations in the cosmic background radiationstudy the cosmic background radiationdiscovery of the cosmic background radiationprimordial radiation
weak
faint cosmic background radiationuniform cosmic background radiationancient cosmic background radiationall-sky survey of cosmic background radiation

Examples

Examples of “cosmic background radiation” in a Sentence

verb

British English

  • The data were used to cosmic-map the early universe's structure. (extremely rare, non-standard)

American English

  • The team aims to precisely background-map the radiation. (extremely rare, non-standard)

adverb

British English

  • The universe expanded cosmically and rapidly. (not directly related)

American English

  • The radiation is uniformly distributed background-wise. (awkward, non-standard)

adjective

British English

  • The cosmic-background data is crucial for cosmology.

American English

  • The cosmic background signal is incredibly faint.

Usage

Meaning in Context

Business

Virtually never used.

Academic

Core term in cosmology, astrophysics, and physics. Appears in research papers, textbooks, and lectures.

Everyday

Rare, except in popular science media (documentaries, articles).

Technical

Precisely defined term with specific parameters (temperature ~2.7K, microwave wavelength). Used in satellite mission names (e.g., COBE, WMAP, Planck).

Vocabulary

Synonyms of “cosmic background radiation”

Strong

3K radiationBig Bang afterglow

Neutral

cosmic microwave background (CMB)relic radiation

Weak

primordial glowbackground radiation from space

Vocabulary

Antonyms of “cosmic background radiation”

localised radiation sourcestellar radiation

Watch out

Common Mistakes When Using “cosmic background radiation”

  • Mispronouncing 'cosmic' as /ˈkɒz.mɪk/ instead of /ˈkɒz.mɪk/.
  • Using it as a countable noun (e.g., 'a cosmic background radiation'). It is an uncountable, singular phenomenon.
  • Confusing it with general 'background radiation' from radioactive materials on Earth.

FAQ

Frequently Asked Questions

Arno Penzias and Robert Wilson accidentally discovered it in 1965 while working with a radio telescope at Bell Labs, for which they received the Nobel Prize.

It has a temperature of approximately 2.7 Kelvin (-270.45°C or -454.81°F), just barely above absolute zero.

Because it is a pervasive, uniform signal that appears as a faint 'background' to all other astronomical observations, coming from beyond any individual star or galaxy.

They represent tiny density variations in the early universe that, under gravity, eventually grew into the galaxies, stars, and large-scale structure we see today.

The faint, uniform, microwave radiation filling all of space, a remnant of the Big Bang.

Cosmic background radiation is usually academic, technical, scientific journalism in register.

Cosmic background radiation: in British English it is pronounced /ˌkɒz.mɪk ˌbæk.ɡraʊnd ˌreɪ.diˈeɪ.ʃən/, and in American English it is pronounced /ˌkɑːz.mɪk ˌbæk.ɡraʊnd ˌreɪ.diˈeɪ.ʃən/. Tap the audio buttons above to hear it.

Phrases

Idioms & Phrases

  • “The afterglow of creation”
  • “The oldest light in the universe”

Learning

Memory Aids

Mnemonic

Think of a quiet, persistent hum (background noise) left over from the enormous BANG (Big Bang) that started the universe.

Conceptual Metaphor

The universe's birth certificate; The echo of the Big Bang; The fossilised light of creation.

Practice

Quiz

Fill in the gap
The is considered the oldest light in the universe, a direct remnant of its hot, dense beginning.
Multiple Choice

What does cosmic background radiation primarily consist of?

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