What feature of interstellar dust is inferred by the polarization of starlight?

Name: What feature of interstellar dust is inferred by the polarization of starlight?
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Question

Quizplus · Accepted Answer

Interstellar dust grains can align themselves in the presence of magnetic fields, causing the polarization of starlight that passes through them. This polarization is used to infer the shape of the dust grains, as the way light is polarized depends on the orientation and elongation of the grains.

What Feature of Interstellar Dust Is Inferred by the Polarization