This gives a mass to light ratio of M/Lv of 21+14−10 solar units which implies that And II contains a significant amount of dark matter.

However, the observation of RR Lyrae variables and blue horizontal-branch stars demonstrates the existence of a population segment with an age greater than 10 Gyr.

This raises the question of whether there is a correlation between a radial horizontal-branch gradient and the metallicity dispersion between dwarf spheroidal galaxies.

[5] And II appears to be in the possession of a stellar stream, a feature that is indicative of a merger event in the past.

[10] The characteristics of And II can best be explained by the merger of two disky dwarf galaxies, some 5 billion years ago.