Definition of globular cluster in US English:

globular cluster

noun

Astronomy
  • A large compact spherical star cluster, typically of old stars in the outer regions of a galaxy.

    • ‘The new findings promise a better understanding of how galaxies and globular clusters first formed billions of years ago.’
    • ‘In the 1900s American astronomer Harlow Shapley studied the distribution of globular clusters in our galaxy.’
    • ‘The oldest stars, which lie inside globular clusters that orbit our galaxy, are estimated to be at least 12 billion years old.’
    • ‘Be warned that first-timers can find it difficult to appreciate galaxies, globular clusters, and planetary nebulae.’
    • ‘He also discovered the retrograde rotation of the system of globular clusters around the galaxy.’