"WE STILL LIVE!" ...John Carter
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PLANETS

Edgar Rice Burroughs carried his inventive creativity beyond the desert world of Mars. Barsoom, as Mars is known by its inhabitants, is only one of many worlds catalogued by Martian astronomers. Moving outward from the sun, the Barsoomian names for the planets of the solar system are:

RASOOM -- MERCURY
COSOOM -- VENUS
JASOOM -- EARTH
BARSOOM - MARS
SASOOM -- JUPITER

Also named are the two moons of Barsoom.

THURIA -- PHOBOS
CLUROS -- DEIMOS

In Swords of Mars, John Carter describes the moons as Thuria, the larger moon orbits around Barsoom at 5,800 miles from the planet's surface; Cluros is slightly smaller and orbits at 14,500 miles.

From The Skeleton Men of Jupiter we learn the Morgors have a naming convention based on their language:

GAROBUS - MARS - BARSOOM
EUROBUS - JUPITER - SASOOM

Within the Burroughsian universe, it can be said that no characters ever visited Rasoom (Mercury). In an unrelated series of stories Carson Napier traveled to and landed upon Cosoom (Venus). Many different tales took place on Jasoom (Earth) and Barsoom (Mars). Only one tale took place on Sasoom (Jupiter).