Astronomy Picture of the Day
The Globular Cluster-NGC 2808
NGC 2808 is a globular cluster in the constellation called Carina. A Globular cluster is a group of stars held very tightly by gravity, which gives them a spherical shape and high density at their centre. These are some of the oldest stars in our galaxy the Milky Way. Our galaxy has about 150 globular clusters. Those of you who have attended the Astronomy camps last winter may have observed two of the globular clusters: M-15 in the constellation Pegasus and M-63 in Hydra from DPS Tapi through our 12″ Dobsonian Telescope.
NGC 2808 is a massive globular cluster containing more than a million stars and is estimated to be 12.5-billion years old. Generally Globular clusters are made of only one generation of stars, this cluster is composed of three generations of stars all born within 200 million years of the formation of the cluster. It is predicted that that globular clusters contain some of the first stars produced in our galaxy but their origins are unclear.