- Department of Astronomy and Planetary Science research professor Will Grundy co-authored the paper “Trans-Neptunian Binary Mutual Events in the 2020s and 2030s,” published in The Astrophysical Journal Letters. The paper predicts when objects in pairs far beyond Neptune, called trans‑Neptunian binaries, will pass in front of one another so astronomers can learn valuable information on each object’s size, shape and orbit.