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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 • 2559 views

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.

Show examples from the web [+]

War in Syria: 'Domenico free: it's like coming back from Mars'
At the same time there was enough weight to make the menace of 'Mars' march toward you in time whilst the details of the bows bouncing on steel wire cut through.
The big punchy sound was equally good when it came to bringing out the menace of 'Mars' or the impact of Nirvana.
It went into Mars' orbit last week.
Mars' polar ice is mostly CO-2.
I'm Mars' sole survivor.
I pulled it off Mars' computer.
Some of Mars' secrets are best left undiscovered.
Eddie Mars' head looks like a crushed watermelon.
First, we replicate Mars' atmosphere.
The loss of Mars' atmosphere meant that liquid water could no longer exist on its surface.
Pilgrim wasn't just seeing things in Mars' soil.
She's Keith Mars' daughter.
Mars' only crime is foolishness and fraud.
Mars' magnetic field Died sometime around 4.1 billion years ago.
You're Keith Mars' little girl.
That's where Eddie Mars' wife is holed up.
The impact carved out the borealis basin, which covers over 40% of Mars' surface.
Mars' atmosphere is so thin... you don't need a lot of streamlining.
The Hermes, well... it can't enter Mars' orbit. Otherwise, they'll never have enough fuel to make it home.

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.

Show examples from the web [+]

When, again by means of observational data, he finally realized that the only reasonable explanation of Mars's motion was to admit that its orbit was not circular, he did not hesitate to forsake the most sacred axiom of traditional astronomy.
Mars's Eye red dot finder (you can also use a Daisy red dot finder from Walmart or Academy, especially with some modifications)
Mars's sidereal Motion = 0.524032722 Degree/Days
Nevertheless, the exhausting computations and innumerable unsuccessful attempts which led Kepler to the solution of Mars's motion, testify to the great importance he attached to observation.
Well, geography was never my strong suit, but aren't we underneath Mars's north pole?
Our approach is not naive; it is not, as has been said, Venus's softness against Mars's strength.
At a first glance, it is possible to describe Mars's orbit with a model "deferent, 1st epicycle, 2nd epicycle,"where:
But before we even entered Mars's atmosphere it was like she was trying to push us away.

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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