Tag: globular cluster
M2 or NGC 7089 is a globular cluster in the constellation of Aquarius, it is consists of 150,000 stars within a sphere of only 175 light years in diameter.
It is 13 billion years old.
M 13 or NGC 6207, also known as the Great Globular Cluster in Hercules, is an object made up of hundreds of thousands of old stars and it lies in the halo of our galaxy.
It has a diameter of 145 light years, a distance of 22000 light years from Earth, and an apparent magnitude of nearly 6, so it is almost visible to the naked eye.