New, very precise measurements have shown that the rotation of the Milky Way is simpler than previously thought. A remarkable result from the most successful ESO instrument HARPS, shows that a much debated, apparent “fall” of neighborhood Cepheid stars towards our Sun stems from an intrinsic property of the Cepheids themselves.

New, very precise measurements have shown that the rotation of the Milky Way is simpler than previously thought. A remarkable result from the most successful ESO instrument HARPS, shows that a much debated, apparent “fall” of neighborhood Cepheid stars towards our Sun stems from an intrinsic property of the Cepheids themselves.