| 1. | Is its gravitational power coming from a thick cluster of stars?
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| 2. | English astronomer John Herschel described it as " coarsely scattered clusters of stars ".
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| 3. | A map she recreated later from memory resembled a cluster of stars named Zeta Reticula.
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| 4. | One recent estimate suggested that the universe was actually younger than certain globular clusters of stars.
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| 5. | Studying the Arches cluster, which is currently the densest cluster of stars in binary system.
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| 6. | For instance, by studying clusters of stars, you can tell the age of the galaxy.
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| 7. | Which of these objects are stars and which are galaxies, that is, giant clusters of stars?
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| 8. | But in recent years, astronomers have realized that collisions are not uncommon within dense clusters of stars.
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| 9. | During much of their work, William Herschel believed that these nebulae were merely unresolved clusters of stars.
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| 10. | Their " Catalogue of One Thousand New Nebulae and Clusters of Stars " was published in 1786.
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