I quite like the star-dust imagery. We are all literally made up of matter, the same matter that constitutes the planets and the stars themselves. The Earth is understood to have formed from the very same matter that formed the Sun itself — gaseous swirls of matter (as seen in nebulae) condensing into varying forms of stars, small planets, gas giants, etc.
As such we are all literally made of star-dust, the very essence that constitutes our sun is also what constitutes our flesh and blood bodies and all that we imbibe to sustain life!
Perhaps this fuller explication helps to convey the appreciation I have for the term and its expressive potency!