Launching June 15 from Mojave, Calif., a Prospector-18D liquid-fueled rocket is to carry a set of small satellites high into the air to test how well they handle the shock, heat and vibration of launch. The satellites, each a 4-inch cube, are packed with sensors and equipment for the test flight that is expected to lead to an orbital mission next year. Advances in the small satellites' design could be used in the future in other spacecraft.

Credit: NASA