The one-revolution dust trail is dust that has completed one orbit: the stream of dust released in the return of the comet prior to the current 1862 return. This mechanism replaces earlier ideas that the outbursts were due to a cloud of dust moving in a 60-year orbit.
Dust trail from a single revolution, dust released during the comet's return journey in 1862, replacing earlier ideas that outbursts were caused by a cloud of dust moving on a 60-year orbit.