Celebrity in space? (4)

I believe the answer is:

star

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This could be a double definition.

'celebrity' is the first definition.
(I know that star is a type of celebrity)

'space?' is the second definition.
The answer and definition can be both shapes as well as being singular nouns.
Maybe you can see an association between them that I can't see?

'in' is the link.

Can you help me to learn more?

(Other definitions for star that I've seen before include "Major" , "Famous actor" , "eg The sun" , "For example, Marilyn Monroe" , "Outstanding person" .)

I've seen this clue in the Evening Standard.

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