Star clusters

The nebula NGC 3603

Star clusters

Stars tend to form together in one of two types of cluster. Globular clusters typically have a thousand or more old stars that form a symmetrical, sphere-like shape. The stars in open clusters are relatively young and fewer in number.

The stars in any one cluster are related to one another by their common origin – they are all believed to have formed at roughly the same time from the same cloud of gas and dust.

When the stars in an open cluster are less tightly packed, they are called an association.

Image: Thousands of stars inside the giant nebula NGC 3603 (credit: NASA, ESA, and the Hubble Heritage STScI/AURA-ESA/Hubble Collaboration)

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The nebula NGC 3603

Introduction

Stars often grow up in a group.

About Star clusters

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