Australian and South American researchers posit wandering “ploonets” as unseen actors in distant solar systems. Moons ejected from orbits around gas giant exoplanets could explain several astronomical mysteries, an international team of astronomers suggests. Researchers led by Mario Sucerquia, from the Universidad de Antioquia, Colombia, and Jaime Alvarado-Montes from Australia’s Macquarie University, modelled the likely…