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