What's the difference between "the Earth" and "earth"?
The word "earth" could be used just like any regular noun-- countably, with an article, possessive etc. Ex: Our earth may simply be one of many. However "earth" is used with "the", and often capitalised, when you mean 'our' "Earth". Ex: Climate change threatens the Earth. So when you use the name of any planet/moon/asteriod, you would generally not use an article. Our planet Earth, our moon and the Sun are the only exception to this rule. Ex: Of the eight planets orbiting our sun, Earth is the third closest. Ex: Aliens visiting Earth might find humans very strange.
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