Mars Dust

This article by NASA written in July of 2003 describes a series of dust clouds that formed on Mars that were so dense and thick that they could be seen with only a backyard telescope on Earth. Apparently the dust on Mars is very fine and thus it is possible to have dust storms on Mars even though there is very little atmosphere or wind. Also, since the dust is so fine, and the sun is so bright, the particles of dust reflect the sun and the dust cloud almost glows.