Hub­ble dis­cov­ers clus­ter of clus­ters

Sky at Night Magazine - - BULLETIN - hub­ble­site.org

Over 20,000 glob­u­lar clus­ters have been spot­ted in re­cent im­ages of the Coma Clus­ter, taken by the Hub­ble Space Tele­scope. The find will help astronomer­s track dark mat­ter through­out the clus­ter.

Glob­u­lar clus­ters are dif­fuse balls of stars found in the outer re­gions of gal­ax­ies. The Hub­ble im­ages cap­tured 22,426 glob­u­lar clus­ters spread across the Coma Clus­ter’s 1,000 or so gal­ax­ies, 300 mil­lion lightyears away.

As glob­u­lar clus­ters are smaller and more nu­mer­ous than gal­ax­ies, these im­ages will help re­searchers map the Coma Clus­ter’s grav­i­ta­tional lay­out. As grav­ity within a clus­ter is de­pen­dent on both vis­i­ble and dark mat­ter, such maps will help astronomer­s un­der­stand the role of dark mat­ter within the clus­ter.

A Hub­ble im­age show­ing just a few of the 22,426 glob­u­lar clus­ters it cap­tured in the im­mense Coma Clus­ter

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