What is the difference between a dwarf spheroidal galaxy and a globular cluster? This Wikipedia article states that Segue 1 is either a dwarf spheroidal galaxy or globular cluster associated with our own Milky Way.  I am wondering what the difference is between dwarf spheroidal galaxies and globular clusters, since at first glance is seems that the morphological properties and stellar ages are similar between the two classes of objects.
There are many differences starting from size to the dark matter content... Please check the following link  it has given much information :
 http://www.answers.com/topic/dwarf-spheroidal-galaxy