Mars' vs Mars's

Both 'Mars' and 'Mars's' are correct, but they are used in different contexts. 'Mars'' is the possessive form of the singular noun 'Mars', while 'Mars's' is the possessive form of the singular noun 'Mars' when indicating possession by a singular entity. The choice between the two depends on the style guide you are following or personal preference.

Last updated: April 01, 2024

Mars'

This is correct when indicating possession by a plural entity or when following a style guide that prefers this form.

Use 'Mars'' when indicating possession by a plural entity or following a style guide that prefers this form.

Examples:

The spacecraft landed on Mars' surface.
The scientists studied Mars' atmosphere.
The rovers explored Mars' terrain.

Alternatives:

Mars's
The spacecraft landed on the surface of Mars.
The scientists studied the atmosphere of Mars.
The rovers explored the terrain of Mars.

Mars's

This is correct when indicating possession by a singular entity.

Use 'Mars's' when indicating possession by a singular entity.

Examples:

The mission is exploring Mars's geology.
NASA's rover is studying Mars's climate.
Mars's orbit around the sun is elliptical.

Alternatives:

Mars'
The mission is exploring the geology of Mars.
NASA's rover is studying the climate of Mars.
The orbit of Mars around the sun is elliptical.

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Mars' vs Mars's

Mars'

Mars's

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