Rocket 1, Rocket 2, and Rocket 3 were a series of small-lift space launch vehicles designed, manufactured, and operated by American company Astra. The rockets were designed to be manufactured at minimal cost, employing very simple materials and techniques. They were also designed to be launched by a very small team, and be transported from the factory to the launch pad in standard shipping containers. Rocket 1 was test vehicle made up of a booster equipped with five Delphin electric-pump-fed rocket engines, and a mass simulator meant to occupy the place of a second stage. Rocket 2 was a prototype similar to Rocket 1. Rocket 3 was a launch vehicle which added a pressure-fed second stage to the Delphin-powered booster. Its definitive variant, Rocket 3.3, featured a lengthened booster, and delivered satellites to orbit.