ALMA catches ‘intruder’ redhanded in rarely detected stellar flyby event

Scientists made a rare detection of a likely stellar flyby event in the Z Canis Majoris (Z CMa) star system. An intruder — not bound to the system — object came in close proximity to and interacted with the environment surrounding the binary protostar, causing the formation of chaotic, stretched-out streams of dust and gas in the disk surrounding it.