Hi Viceidol The names of the planets are capitalised and no article is used: Mars, Jupiter, Venus, Earth. In speech people often say the earth when referring to our planet. There are expressions and sayings without the article: What on earth did he mean?
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Feebs11You need to capitalise "the Earth" to differentiate it from "the earth" - the soil in which things grow.Logic would have it that way but in English logic doesn't always apply. Some capitalise it, some don't: