noun
A large planet or celestial body that is significantly larger than Earth
adjective
Describing something as extremely large or massive in comparison to Earth
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A mega-Earth is a hypothetical planet that is much larger than Earth.
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Have you heard about the concept of a mega-Earth? It's fascinating!
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That planet is like a mega-Earth, it's huge!
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Her love for him was like a mega-Earth, vast and all-encompassing.