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APOD
Astronomy Picture of the Day
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
Open Cluster M25
Explanation: Many stars like our Sun were formed in open clusters. The above pictured open cluster, M25 , contains thousands of stars and is about two thousand light years distant . The stars in this cluster all formed together about 90 million years ago. The bright young stars in M25 appear blue. Open clusters , also called galactic clusters, contain fewer and younger stars than globular clusters . Also unlike globular clusters , open clusters are generally confined to the plane of our Galaxy . M25 is visible with binoculars towards the constellation of the Archer ( Sagittarius ).
| Date | August 31, 2009 |
|---|---|
| Credit | Credit & Copyright: Jean-Charles Cuillandre ( CFHT ) & Giovanni Anselmi ( Coelum Astronomia ), Hawaiian Starlight |
| Authors & editors: | Robert Nemiroff (MTU) & Jerry Bonnell (UMCP) |
| A service of: |
ASD at NASA / GSFC, NASA Science Activation & Michigan Tech. U. |