The planet mars would most closely resemble the surface of earth if it were half as big as it actually is (making it a medium-sized planet).
However, compared to other planets in the solar system, Mars is similar to Earth in many ways. Both places have ice caps, volcanoes, valleys, mountains, and weather. The Martian day, at 24 hours and 39 minutes, is only marginally longer than the Earthly day.
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