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The nebula's sparkling centerpiece is a giant, young star cluster named NGC 2070, only 2 million years old. Its stellar inhabitants number roughly 500,000. The cluster is a hotbed for young, massive stars. The cluster's dense core, known as R136, is packed with some of the heftiest stars found in the nearby universe. The cluster's core is home to more than 10,000 stars. Several of them may be over 100 times more massive than our Sun.
In April 2014, Hubble data was used to weigh the largest known galaxy cluster in the distant universe—catalogued as ACT-CL J0102-4915—finding it lives up to its nickname, El Gordo (Spanish for "the fat one"). By measuring how much the cluster's gravity warps images of galaxies in the distant background, astronomers calculated El Gordo's mass to be as much as three million billion times the mass of our sun—roughly 43 percent more massive than earlier estimates.
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