This drawing illustrates "eccentricity".
Click on image for full size
Martian Orbit affects Climate
This drawing illustrates the large differences in distance from the sun possible for Mars. (The drawing exaggerates the size scales a little).
If conditions are just right, there are times when Mars can experience a great deal more warming by the sun than normal.
Earth does not have the potential for the kind of climate extremes that Mars does.
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