# interstellar

/ˌɪntɝˈstɛɫɝ/ (US) · /ˌɪntəstˈɛlɐ/ (UK) · CEFR C1 · Adjective

Source: https://englishreference.com/word/interstellar
Updated: 2026-05-06

## Definition

describing the space between stars or travel that happens between them.

For teachers: situated or occurring between the stars of a galaxy. Often used in scientific contexts to describe the vast regions of space or the medium found there.

## Examples

- Scientists study interstellar dust to learn about how stars form.
- The Voyager 1 spacecraft became the first human-made object to enter interstellar space in 2012.
- Theoretical physics suggests that interstellar travel would require propulsion systems capable of reaching a significant fraction of the speed of light to bridge the gap between solar systems.

## Usage notes

- Typically used attributively before a noun.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.