‘Oumuamua, Our First Interstellar Visitor, May Have Been a Comet After All

A new study set to appear in Astrophysical Journal Letters by Darryl Seligman and Greg Laughlin of Yale along with Konstantin Batygin of Caltech is seeking to resurrect the comet hypothesis. After revisiting all the available observations and constructing new models of ‘Oumuamua, they argue that the object’s acceleration can be explained if it is indeed a roughly cigar-shaped comet that outgassed perhaps 10 percent of its total mass as a nozzle-like jet of relatively pure water vapor that migrated across the surface in lockstep with the warmth of the sun.

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