This is the Saturn I rocket on display in the rocket garden at the US Space & Rocket Center in Huntsville, Alabama. The Saturn I was the first series of Saturn rockets to fly. It consisted of two stages. The first stage, called the S-I, featured eight H-1 engines. The second stage, called the S-IV, had six RL10 engines. There were 10 Saturn I flights including five test flights, two Apollo boilerplate launches, and three flights of the Pegasus experiment. The Pegasus satellite featured a large wing that would measure the size and frequency of micrometeoroids, data that would influence the design of all future spacecraft. The Saturn I on display is a test vehicle that was never intended for flight. It is set up in the configuration of the Pegasus flights. Note the shape of the fins, which are shorter and less angular than those on the Saturn IB.