cosmic ray: meaning, definition, pronunciation and examples
C2Technical/Scientific
Quick answer
What does “cosmic ray” mean?
A high-energy particle, primarily originating from outer space, that travels at nearly the speed of light.
Audio
Pronunciation
Definition
Meaning and Definition
A high-energy particle, primarily originating from outer space, that travels at nearly the speed of light.
The term can also refer to the stream of such particles collectively, which constantly bombard the Earth's atmosphere.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Spelling follows standard conventions (e.g., 'cosmic', not 'kosmic').
Connotations
Identical scientific connotations in both varieties.
Frequency
Used with identical frequency in academic and scientific contexts in both regions.
Grammar
How to Use “cosmic ray” in a Sentence
N + of + cosmic rays (e.g., 'a flux of cosmic rays')V + by/with + cosmic rays (e.g., 'bombarded by cosmic rays')Adj + cosmic + ray (e.g., 'energetic cosmic ray')Vocabulary
Collocations
Examples
Examples of “cosmic ray” in a Sentence
verb
British English
- The instrumentation is designed to cosmic-ray-shield the sensitive electronics.
American English
- The satellite's components were hardened to cosmic-ray-proof the system.
Usage
Meaning in Context
Business
Rarely used. Might appear in the context of aerospace, insurance for satellite equipment, or scientific venture capital.
Academic
Common in astrophysics, particle physics, atmospheric science, and space engineering research papers.
Everyday
Extremely rare. Might be mentioned in popular science articles or documentaries about space.
Technical
The primary register. Used precisely to describe the phenomenon and its measurements, origins, and effects.
Vocabulary
Synonyms of “cosmic ray”
Strong
Neutral
Weak
Vocabulary
Antonyms of “cosmic ray”
Watch out
Common Mistakes When Using “cosmic ray”
- Using it as a countable noun in singular form for the general phenomenon (e.g., 'Cosmic ray is dangerous' - better: 'Cosmic rays are...').
- Confusing it with 'cosmic microwave background' radiation.
- Misspelling as 'cosmic rei' or 'cosmick ray'.
FAQ
Frequently Asked Questions
On Earth's surface, we are largely protected by the atmosphere. However, astronauts and airline crews at high altitudes receive higher doses, which is a concern for long-duration spaceflight.
Most originate outside our solar system, likely from supernova explosions, active galactic nuclei, and other high-energy astrophysical events. Lower-energy ones come from our Sun.
No, they are invisible. We detect them indirectly through the showers of secondary particles they create when hitting the atmosphere or through instruments like cloud chambers and particle detectors.
A cosmic ray is a high-speed particle (like a proton or atomic nucleus). A gamma-ray is a high-energy photon, a form of electromagnetic radiation, like light but with much more energy.
A high-energy particle, primarily originating from outer space, that travels at nearly the speed of light.
Cosmic ray is usually technical/scientific in register.
Cosmic ray: in British English it is pronounced /ˌkɒz.mɪk ˈreɪ/, and in American English it is pronounced /ˌkɑːz.mɪk ˈreɪ/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “None”
Learning
Memory Aids
Mnemonic
Imagine a tiny, super-fast bullet from a star (COSMIC) shooting (like a RAY of light) through space towards Earth.
Conceptual Metaphor
COSMIC RAYS ARE BULLETS/ARROWS (e.g., 'penetrating the atmosphere', 'shower of particles').
Practice
Quiz
What is a 'cosmic ray' primarily composed of?