Definition:Earth/Linguistic Note
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Linguistic Note on Earth
Earth is a proper name: that of the planet on which (at time of writing) all humans live.
As such, its correct styling is for it to start with a capital letter.
This is the convention to be used on $\mathsf{Pr} \infty \mathsf{fWiki}$.
However, in much literature it can be seen referred to as the earth, which is a bit like, for example, referring to Albert Einstein as the albert.
In recent literature, particularly popular, new-age and poetic, there is a trend to referring to the place as Planet Earth.