Martian ice caps

It was observed that Mars has polar ice caps, drawing another parallel between Mars and Earth. The axial tilt of Mars was used to infer the presence of ice caps as these regions had visible ice, suggesting a climate phenomenon somewhat similar to Earth's.
 William Herschel England 1784 Martian ice caps

It was observed that Mars has polar ice caps, drawing another parallel between Mars and Earth. The axial tilt of Mars was used to infer the presence of ice caps as these regions had visible ice, suggesting a climate phenomenon somewhat similar to Earth's.