A hypothetical celestial body composed of antimatter that would have planetary characteristics and properties.
From anti- (against/opposite) + planet. The prefix anti- in physics refers to antimatter (particles opposite to normal matter), while planet comes from Greek planetes (wandering star).
Antiplanets exist only in theoretical physics—if one formed from antimatter, it would annihilate instantly upon touching normal matter, releasing tremendous energy. This word reveals how scientists use 'anti-' to describe the universe's opposite twins.
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