Sunday, August 23, 2015

apostrophe - Mars's or Mars'?

I'm a pretty fluent English speaker, but this has been bothering me for a long time... It all started when I saw people, for example, saying Mars' atmosphere, according to my knowledge, the only time you have an apostrophe without an "s" is when said word is plural, so in this case it would be Mars's or not Mars'. Am I correct? (I'm using the word Mars merely as an example, this applies to other singular words that ends with an "s" as well.)

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