According to the quote below "the earth" is incorrect. Can you please explain the difference between "earth" and "the earth" in "paradise on (the)earth"?
"In this case, we are talking about a metaphorical paradise in the real world as opposed to the type of literal paradise in the afterlife of some religion, so we usually say "paradise on earth". "Paradise on the Earth" would be a contrast with a "paradise on the moon" or a "paradise on Mars."
It is not so much the "the" as the capital letter. If you write "Earth" you mean the planet, and it often takes the article.
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It is not so much the "the" as the capital letter. If you write "Earth" you mean the planet, and it often takes the article.
The problem here is that you can never say "on moon." It always has to be "on the moon." And you can never say "on the Mars." It always has to be "on Mars." However, depending on the context, "on Earth" or "on the Earth" can be correct.