stardust

or star dust

[ stahr-duhst ]
/ ˈstɑrˌdʌst /

noun

(not in technical use) a mass of distant stars appearing as tiny particles of dust.
a naively romantic quality: There was stardust in her eyes.

Origin of stardust

First recorded in 1835–45; star + dust

British Dictionary definitions for stardust

stardust
/ (ˈstɑːˌdʌst) /

noun

dusty material found between the stars
a large number of distant stars appearing to the observer as a cloud of dust
a dreamy romantic or sentimental quality or feeling