Space exploration is a field of study that involves the exploration of outer space. Space explorers are people who work in this field, and they can take on many roles. Astronauts are individuals who travel into space, often aboard spacecrafts, to conduct research and experiments. Probes are unmanned spacecrafts that are sent into space to collect data and images. NASA is an organization that is responsible for the development and operation of spacecrafts and other space exploration projects.