open cluster in a sentence

Examples

1. The older open clusters tend to contain more yellow stars.
2. They may be former members of a dissolved open cluster.
3. Under exceptional conditions, open clusters can remain intact for up to 100 million years.
4. It is a member of the Collinder 121 open cluster.
5. IC 410, a faint nebula, is accompanied by the bright open cluster NGC 1893.
6. Open clusters are also easily detected in many of the galaxies of the Local Group.
7. In the foreground is the open cluster NGC 6530.
8. Open clusters are often classified according to a scheme developed by Robert Trumpler in 1930.
9. The closest open clusters can have their distance measured directly by one of two methods.
10. R136 itself is just the central condensation of the much larger NGC 2070 open cluster.