Stardust

Full definition of stardust

(usually uncountable; plural stardusts)

Particles of matter that fall from the stars down to Earth; often used idiomatically to suggest a fanciful or dreamlike quality. My sister's eyes were full of stardust, and she'd spend hours lazily planning her future life when she would make her big break in the movies.
(informal, dated, astronomy) A distant cluster of stars, resembling a cloud, the individual stars of which cannot be resolved.