. # 16
The Hercules cluster, M13.  Now we'll move out of our Galaxy and then
look back at it.  The Hercules Globular star cluster is a group of about
1 million very old stars (about 10 billion years old; twice the Sun and
maybe half the Universe) that orbits our Galaxy once every 1/4 billion
years.  It's about 25,000 light-years away, and is just one of about a
hundred star clusters, though it's the most prominent one in the
Northern sky.


#16     from IMG0010.pcd, taken 09/10/93, f/6.3, ASA 100, 6min