Dust
Not the dust one finds around the house (which is typically fine
bits of fabric, dirt, and dead skin cells). Rather, irregularly shaped grains
of carbon and/or silicates measuring a fraction of a micron across which are
found between the stars. Dust is most evident by its absorption, causing large
dark patches in regions of our Milky Way Galaxy and dark bands across other
galaxies.
Source: wikipedia, NASA
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