Chōfu is a city in the western side of Tokyo Metropolis, Japan. As of 1 April 2021, the city had an estimated population of 238,087, and a population density of 11,000 per km2. the total area of the city is 21.58 square kilometres (8.33 sq mi).

The Japan Aerospace Exploration Agency (JAXA) is the Japanese national air and space agency. Through the merger of three previously independent organizations, JAXA was formed on 1 October 2003. JAXA is responsible for research, technology development and launch of satellites into orbit, and is involved in many more advanced missions such as asteroid exploration and possible human exploration of the Moon. Its motto is One JAXA and its corporate slogan is Explore to Realize.