Where is Earth's submoon?

The duo kicked off an internet firestorm late last year when they posted a draft of their article examining the possibility of moons that orbit other moons on a preprint server for physics and. astronomy manuscripts.. This simple question -- asked by the four-year old son of Carnegie's Juna Kollmeier -- started it allTheir findings are the basis of a paper published in Monthly Notices of the Royal Astronomical Society.. After discussing this very simple question at a seminar, the two joined forces to solve it. Not long after this initial bedtime query, Kollmeier was coordinating a program at the Kavli Institute for Theoretical Physics (KITP) on the Milky Way while her one-time college classmate Sean Raymond of Université de Bordeaux was attending a parallel KITP program on the dynamics of Earth-like planets