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The planet flash card maker creates unique planet flash cards for Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and the dwarf planet Pluto. You can print the flashcards or study them online from your device. The flash card color, size, and content can be customized to meet your preferences. Facts included for each planet are the name of the planet, diameter, gravity, length of day, orbital period, mean temperature, number of moons and ring system. After customizing you can download them as a printable document in PDF format. The document can be optimized for US Letter or A4 paper sizes.