Between the stars; existing or happening in the space that separates different stars.
From Latin 'inter-' (between) + 'stella' (star) + English '-ar' (relating to). The astronomical term became common in English in the 1800s as telescopes revealed space between stars.
Interstellar space isn't actually empty—it contains cosmic dust, gas, and mysterious dark matter that outweighs all visible stars combined by a factor of six!
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