Cislunar Explorers is a pair of spacecraft that will show the viability of water electrolysis propulsion and interplanetary optical navigation to orbit the Moon. Both spacecrafts will launch as a single 6U CubeSat as part of NASA’s Artemis-1 mission on the Space Launch System (SLS). The technology spacecraft pair is being developed at Cornell University in New York, by a team of researchers, graduate students, and undergraduates.