An intense, irrational fear of stars or of celestial space.
From Greek 'astro-' (star) and 'phobos' (fear), this modern compound follows the pattern of other phobias to describe an anxiety disorder centered on astronomical objects.
While astrophobia is rare, many people actually experience 'agoraphobia' when looking at the night sky—the vast emptiness can trigger a panic response, showing how our brains struggle with infinity.
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