52 standard playing-card-size flashcards, $24.99. www.carddia.com

Learning about the solar system can be a bit tough, with so many planets and their satellites, and reading through textbooks may make students even more confused. These flashcards could be a great help. This set covers the entire solar system and other major astronomical objects such as galaxies, clusters, and nebulae. Each card has an image on one side, and the object’s name (with its abbreviation or astronomical symbol), structure, and brief description on the other side. Both sides are printed in full-color, and the cards are water- and tear-resistant. A universe infographic is included.