• Star clusters are small groups of stars, smaller than a galaxy.
  • There are two main types, open clusters and globular clusters.
  • Both types are held together by gravity.
  • Open clusters are groups of up to a few thousand stars.
  • Globular clusters contain hundreds of thousands of stars.
  • The heart of the globular cluster M13 is 145 light years in diameter.
  • The cluster contains red and blue giant stars.
  • What stage of life is the blue supergiant in?
  • What will happen to it next?
  • Use the resource below to answer the questions that follow.
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