What's the plural form of interstellar space? Here's the word you're looking for.
Answer
The noun interstellar space can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be interstellar space.
However, in more specific contexts, the plural form can also be interstellar spaces e.g. in reference to various types of interstellar spaces
or a collection of interstellar spaces.
