This counting eBook features NASA space photos. Practice counting from 1 to 20. Count planets, moons, spaceships, comets, meteor craters, and even galaxies. The first set of cards have 1 to 20 objects in order. The second set of cards are shuffled. The shuffled cards will always appear in the same order. Designed to show nice images on a variety of devices. In color where available. NASA did not participate in the writing or publication of this eBook.