This particular collection refers to a promotional strategy implemented by the Hayden Planetarium. In 1949, in order to increase publicity for their space exhibit Conquest of Space , the Hayden Planetarium set up an interplanetary-tour reservations desk that would take reservations for the first trips into space. The museum promised that the collected names would be turned over to the first organization actually planning interplanetary travel. In addition to the desk at the planetarium, interplanetary reservation blanks were printed in major publications worldwide. Between 1950-1953 hundreds of letters were sent in response to the advertisements from all over the United States and the world. Due to the heavy influx of letters from enthusiastic, future space travelers, there is a need to keep these reservations organized if interplanetary space travel does become a reality in the future. Therefore, the letters that were sent to the planetarium have been arranged in this collection and described in the finding aid to assist anyone one who wishes to locate names or reservations in the future. This collection also contains other printed materials related to the Hayden Planetarium. Materials include the Planetarium Annual report from 1949-1950, an original Time Schedule card which was sent to those who wrote the planetarium, and also a list of media outlets listed in the letters.