moon pillar

moon pillar

noun Astronomy.
a halo phenomenon in which a vertical streak of light appears above and below the moon, believed to be caused by the reflection of moonlight by ice crystals with vertical axes.
Compare sun pillar.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Moon pillar is always a great word to know.
So is red giant. Does it mean:
a star in an intermediate stage of evolution, characterized by a large volume, low surface temperature, and reddish hue
the boundary around a black hole on and within which no matter or radiation can escape
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