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EARTH, MOON |
Soil is lower-case “earth.” And in most uses even the planet itself
remains humbly in lower-case letters: “peace on earth.” But in
astronomical contexts, the Earth comes into its own with a proud initial
capital, and in science fiction it drops the introductory article and
becomes “Earth,” just like Mars and Venus. A similar pattern applies to
Earth’s satellite: “shine on, harvest moon,” but “from the Earth to the
Moon.” Because other planets also have moons, it never loses its
article.
