This hunk of stars-shine, was discovered by Messier in 1778.
This cluster for quite a while was thought to be part of the Milky Way
family of fine globulars and about 50,000 light-years away from
us. However, in 1994 things happened that now make astronomers
think that it belongs to the Sagittarius Dwarf Elliptical
Galaxy. This makes M54 the first globular cluster to loose
its citizenship and now declared a extragalactic alien! Who knew!
Astronomers now feel that M54 is some 87,000 light-years away, with a
150 light-years across. Not too shabby for a foreigner. Not
only that it is one of the denser globulars with type III rating.
Other information is that NGC6715 has a luminosity roughly 850,000
times that of our sun and contains a intermediate-mass black hole at
5 images stacked