Page 28 - Astronomy Book 1

PhMore clusters within and some orbiting our Galaxy

More well known open clusters are the “wild duck cluster” M11 (top
opposite) and the “double cluster” in Perseus (bottom opposite).

Some clusters such as the Seven Sisters (above) also have gas clouds
assosiated with them to give patches of blue “reflection” nebulosity.

The more compact globular clusters such as M15 on the right of this
page are also quite common and consist of many thousands of stars
closely packed into ball which closely orbits our Galaxy.

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