An overview of the final years of World War I, emphasizing the role of the United States.

This title features the missions of artificial satellites sent to Mars. Using simple text, maps, and "out-of-this-world" photography, readers learn about the Mariner missions of the 1960s/1970s, plus the U.S. Mars Global Surveyor, Mars Express, Mars Reconnaissance, and others. Also explored are the orbiters of other nations, including Russia, India, and Japan. Planned future missions are also included.

This title features the missions of landers that have been sent to Mars and collected science data and photographs from a stationary point on the planet's surface. Through simple text, maps, and stunning photography, readers will learn about the twin U.S. Viking missions of the 1970s, early Russian efforts, the U.S. Mars Pathfinder, and the European Space Agency's Beagle 2. Planned future missions are also explored.