Janus is quite similar to Epimetheus. Both moon share the same orbit and trade places with each other every four years. Janus is heavily cratered and likely very ancient.
Published by Richard Leis
Richard Leis (he/him) writes poetry and fiction. He lives in Tucson, Arizona where he teaches workshops at The Writers Studio and works for HiRISE, a team at the University of Arizona with a camera in orbit around Mars. View all posts by Richard Leis