Original sentence: Alternative explanations are either that the description as red is a poetic metaphor for ill fortune, or that the dramatic scintillations of the star when it was observed rising left the viewer with the impression that it was red.Secondly, ancient observations of Sirius describe it as a red star, when today Sirius A is bluish white.Sirius A or Sirius B could be responsible for this discrepancy is rejected by astronomers on the grounds that the timescale of thousands of years is too short and that there is no sign of the nebulosity in the system that would be expected had such a change taken place.The possibility that stellar evolution of either.This is a source of speculation for UFO enthusiasts and was the subject of the book The Sirius Mystery by Robert Temple
Edited sentence: It is not believed likely that changes in either Sirius A or Sirius B could have occurred in such as short time.Secondly, it is not clear why ancient observations of Sirius describe it as a red star, when today Sirius A is bluish white.This is a source of speculation for UFO enthusiasts