[AZ-Observing] Re: Mizar as spectroscopic binary


Brian Skiff wrote:

>     Once a long time ago while showing visitors Mizar through
>the Lowell Clark, there was a guy who insisted that the view of
>Mizar AB was simply a slightly magnified view of Mizar + Alcor.
>No amount of explaining that the telescopic view was of just 
>the one naked-eye component convinced him.
>
>     The comment, by the way, that the sky over the weekend was
>clear but very light-polluted was almost certainly caused by
>the second round of Asian dust 
>  
>

Do you know what the cause of the dust is? Is it a natural weather 
phenomenon, or is it from the industrialization and land development in 
China? If the latter it means the poor skies we are having will be a 
frequent phenomenon.
Stan
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