Meaning & use
interstellar
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Meanings
adjectivebefore a noun
Relating to the space between stars, or happening in that space.
Grammar: Used before a noun: interstellar space, interstellar travel. It is not used after a verb.
Patterns
- interstellar space
- interstellar travel
- interstellar dust
- interstellar medium
The probe is now traveling through interstellar space, far beyond our solar system.
Astronomers study interstellar dust to understand how stars form.
Science fiction often imagines interstellar travel between distant star systems.
adjectivebefore a nountechnical
Coming from or existing between stars, as with clouds of gas and dust.
Grammar: Used before a noun, often in scientific contexts: interstellar cloud, interstellar radiation.
Patterns
- interstellar cloud
- interstellar radiation
- interstellar medium
The telescope detected an interstellar cloud rich in organic molecules.
Interstellar radiation can damage spacecraft electronics over long journeys.
The interstellar medium is not empty; it contains gas and dust.
Common combinations
- interstellar space
- Voyager 1 became the first spacecraft to enter interstellar space.
- interstellar travel
- Interstellar travel would require speeds far beyond our current technology.
- interstellar dust
- Interstellar dust can dim the light from distant stars.
- interstellar cloud
- A giant interstellar cloud collapsed to form new stars.
- interstellar medium
- The interstellar medium is the matter and radiation that exist between stars.
Synonyms and how they differ
- interplanetary
- Interplanetary means between planets within one star system; interstellar means between different star systems.
- galactic
- Galactic relates to a galaxy as a whole; interstellar refers specifically to the space between individual stars.
- cosmic
- Cosmic is a broad term for the universe; interstellar is narrower and means between stars.
Word family
Commonly confused: interstellar or interplanetary?
interstellar vs interplanetary
Interplanetary means between planets in the same solar system, while interstellar means between stars in different systems. The prefix inter- means 'between'.
Practice
The spacecraft left our solar system and entered ___ space.
Choose one answer.
Leaving the solar system means going beyond the sun's influence into the space between stars, which is interstellar. Interplanetary would mean it is still within our solar system, between planets.
Make it your own
Write a sentence using “interstellar”, then check it and compare it with the examples above.