An open cluster typically contains anywhere from a few hundred to a few thousand stars. The exact number can vary based on the age and size of the cluster.
It can be called a star cluster, an open cluster or an asterism.
similar age and composition.
The type of star cluster where stars are grouped together in a loose formation with a wide variety of distances between each star is called an open cluster. Open clusters typically contain a few dozen to a few thousand stars and are often found in the arms of spiral galaxies. They are characterized by their relatively young age and lack of a dense core, allowing for the more scattered arrangement of stars. Examples of open clusters include the Pleiades and the Hyades.
open cluster
Because of the high percentage of OB stars, the cluster is a relatively young cluster. M26 has an estimated age of only about 25 million years.
An open cluster typically contains anywhere from a few hundred to a few thousand stars. The exact number can vary based on the age and size of the cluster.
The density of the stars.
Constellation or "asterism". The difference is that "constellations" are officially recognized by the International Astronomical Union, while an "asterism" is any other pattern or grouping of stars.
there are a group of stars that are cclose together
The smallest galaxy - a dwarf galaxy - will contain stars upwards of 30 billion stars. You are thinking of an open cluster, which as the name suggests, is a cluster of stars, not a galaxy. An open cluster is a group of up to a few thousand stars.
It can be called a star cluster, an open cluster or an asterism.
Open Cluster
The age of a star cluster can be determined by looking at the mass of stars at the turnoff point. If the stars at the turnoff point have a mass of 3 times the mass of the Sun (3m), then the age of the cluster is estimated to be around 1 billion years.
Whooooo there. That is a silly question. You or you teacher is forgetting about the total number of stars within a galaxy and cluster. Whilst a globular cluster has mainly older stars compared to an open cluster it will only contain a few billion stars, whereas a galaxy can have upwards of 500 billion stars, many of them old. So the answer is not definitive, but I think the answer you are looking for is global clusters.
similar age and composition.
Some of the brightest stars in the open cluster are found in the "Plough" or the "Ursa Major" just like the Epilson Ursai Majoris.