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TeachMeFinance.com - explain dust grains dust grains The term 'dust grains' as it applies to the area of space can be defined as '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. Dust is most evident by its absorption, causing large dark patches in regions of our Milky Way Galaxy and dark bands across other galaxies. The exact nature and origin of interstellar dust grains is unknown, but they are clearly associated with young stars'. Previous 5 Terms: DURN durometer Durum wheat Dusk Dust Devil Next 5 Terms: Dust Plume Dust Storm dust veil index Dust Whirl Duty Cycle About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.