Mars can be compared to Earth, because they both have numerous similarities.
the earth is polluted and mars isn't :)
Earth is big. Mars is small.
Surface gravity on mars is 0.376 compared to that of the earth.
Mars is only about half the diameter of Earth.
Mars is 6,786 Km. in diameter. Big is a relative term. It is big compared to its moons but small compared to the sun
earth
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Mars is farther away from the sun.
The gravity of Earth is 2.6 times that of Mars.
The surface gravity on Mars is about 37% or 3/8 that on Earth.
Neptune is much colder than Mars.
Mars would be brighter compared to Saturn because it is closer to Earth.