Mars can be compared to Earth, because they both have numerous similarities.
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
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Mars is farther away from the sun.
Mars is about 53% the size of Earth. This means that if you were to represent the size of Mars compared to Earth as a fraction, it would be 0.53/1.
Neptune is much colder than Mars.
A year on Mars is equal to 687 Earth days. That is about 2 Earth years.
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Mars is very similar to Earth. Mars' year and day are very similar to Earth compared to other planets.
Eath is 1,083,00 km3 , Mars is 163,140,000,000 km3
Mars is the second smallest planet. Only Mercury is smaller.