Stardust/ˈstɑːrdʌst/ Definition 1 of 3Pro Tip 1/3Space Research Stardust often appears in contexts discussing astronomy or space exploration. Astronomers detected stardust in the comet's tail. Pro Tip 2/3Not Literal Dust Stardust doesn't mean common dust, but refers to particles from outer space. The museum's exhibit on stardust fascinated the students. Pro Tip 3/3Scientific Language Used in scientific contexts; may not always be used in casual conversation. The probe will collect stardust to analyze back on Earth.