Scientists at home are rooting for India-born American astrophysicist Dr Arjun Dey, who is being feted by the international media after making public his theory on the expansion of the universe. Physicists at the M P Birla Planetarium here have described the work of Dey, a post doctoral fellow at John Hopkins University in Baltimore, USA, as "real landmark" in the field of astrophysics.Dey's theory, a breakthrough in the field, is based on the study of the shifts of spectral lines between galaxies. For the first time, evidence has been found that the red shift between two galaxies was more than five points on the spectral scale.