... Galaxies: M81, Virgo cluster NGC 4594, the Andromeda nebula. 3. ... are always repeated, so that, for instance, hearts of vertebrates are as a rule on ... Action pr ofile of the Andr omeda nebula M31 vs. for differ ent from a star ...
... Galaxies: M81, Virgo cluster NGC 4594, the Andromeda nebula. ... are always repeated, so that, for instance, hearts of vertebrates are as a rule on ... Figure 21 shows the 'temporal activity' profile of the Andromeda nebula. ...