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This lithograph shows an image of Mars on the front, with informational text on the back about how the Hubble Space Telescope (HST) has been used to study Mars weather. HST took this image on March 30, 1997, just as it was making a close pass to Earth some 60 million miles (100 million km) away. It shows Mars during the transition between spring and summer in the northern hemisphere (summer solstice). The north polar carbon dioxide (dry ice) frost cap is rapidly evaporating from solid to gas, revealing a much smaller permanent water ice cap. Bright water ice clouds are visible across the center and along the bottom of the image.