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Wiktionary
starstuff

n. The material composition of stars; matter originated from stars; starmatter.

Wikipedia
Starstuff

Starstuff is an hour-long children's television program taped at WCAU-TV Studios on City Line Avenue in Bala Cynwyd, Pennsylvania. It was shown in the Philadelphia television market only. There was only one season of Starstuff with a total of 18 episodes airing on Saturday mornings. While it was first shown in 1980, it was rerun repeatedly throughout the next several years. The opening and closing music consisted of a melange of music from Gustav Holst's The Planets suite, movements four and six, Jupiter and Uranus.

Usage examples of "starstuff".

No damage, though-the hull could shed starstuff for a time, so yorik coral was no real problem.

It was roughly brickshaped, four meters by ten by thirty-two, and made of starstuff: metal and glass and plastic, sheathed with darkly luminous stuff that took the energy from sunlight.