Used in astronomy to describe a star's sudden brightening. Reflects a significant, yet temporary change. The nova was so bright it outshone all other stars in its vicinity for weeks.
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Metaphorical Use
Sometimes used metaphorically to indicate a sudden, temporary success or recognition. The young author's book was a nova, getting instant fame.
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Rare Sight
Represents an uncommon event, so it might imply rarity or uniqueness in various contexts. Seeing the superstar in our small town felt like spotting a nova.