The National Aeronautics and Space Administration (NASA) has made major contributions to the study of space and the mysterious objects found in it. Their missions to understand how the universe works have led to great strides in human knowledge. In this exciting series, readers will explore six of NASA's most important and ongoing missions--from the sun to the farthest reaches of our solar system, and beyond! Dazzling photographs of NASA spacecraft, distant galaxies, and technicians at work are sure to draw in readers of all ages.