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blue clearing


'blue clearing' can also refer to...

 

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An occasion when the surface markings of Mars can be seen clearly through Earth-based telescopes fitted with a blue filter. Normally the surface features of Mars are at best very faint and at worst invisible through a blue filter, and the atmosphere and white clouds appear much brighter. The reality of blue clearings has been questioned.

Subjects: Astronomy and Astrophysics.


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