What is the size of interstellar dust? Is it the same size as household dust?
Interstellar dust grains come in many sizes — from smaller than a tenth of a micron to many microns wide (a micron is one-millionth of a meter). It is not the dust one finds around the house, which is typically fine bits of fabric, dirt, or dead skin cells. Rather, interstellar dust grains are much smaller clumps, on the order of a fraction of a micron across, irregularly shaped, and composed of carbon and/or silicates.
