SUNSET: 
Summer Quest for Noctilucent Clouds
Noctilucent clouds form at the boundary between Earth and space. Their electric blue billows incite the imagination and inspire us to keep watch at dusk for their arrival.
mesosphere
Noctilucent clouds form at the boundary between Earth and space. Their electric blue billows incite the imagination and inspire us to keep watch at dusk for their arrival.
By: Bob King June 19, 2014
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