Astronomy Picture of Day: Springtime on Mars# Astronomy - 天文
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Springtime on Mars
Credit: MSSS, JPL, NASA
Explanation: Vast canyons, towering volcanoes, sprawling fields of ice, deep craters, and high
clouds can all be seen in this image of the Solar System's fourth planet: Mars. The orbiting
robot Mars Global Surveyor spacecraft took the above mosaic of images as springtime dawned
in Northern Mars in 2002 May. Sprawled across the image bottom is Valles Marinaris, a
canyon three times the length of Earth's Grand Canyon, and four times
Credit: MSSS, JPL, NASA
Explanation: Vast canyons, towering volcanoes, sprawling fields of ice, deep craters, and high
clouds can all be seen in this image of the Solar System's fourth planet: Mars. The orbiting
robot Mars Global Surveyor spacecraft took the above mosaic of images as springtime dawned
in Northern Mars in 2002 May. Sprawled across the image bottom is Valles Marinaris, a
canyon three times the length of Earth's Grand Canyon, and four times