Free Astronomy Magazine November-December 2026

GW Orionis lies about 1,300 light- years away in the Orion constella- tion. Its three young stars are encircled by a massive disk whose three dust rings are tilted at differ- ent angles instead of sharing a sin- gle plane. This unusual geometry has made the system an important laboratory for studying how com- plex stellar environments influence the disks where planets form. The research was led by Maria Gal- loway-Sprietsma, a PhD candidate at the University of Florida. The team fitted the streamer’s shape and velocity to reconstruct its trajec- tory. Their best-fit model places the streamer’s angular-momentum vec- tor within about 3 degrees of the outer ring, compared with a mis- alignment of about 32 degrees rel- ative to the inner ring. This close correspondence suggests that the infalling material is the likely driver of the outer disk’s tilted structure. The result supports a more dynamic picture of planet formation than the familiar model of an isolated, orderly disk. Material from a sur- rounding molecular cloud can con- tinue to fall onto an evolved young system in clumpy streams, changing a disk’s mass and angular momen- tum and potentially influencing the orbital architecture of planets that form there. NOVEMBER-DECEMBER 2026 !