Hubble Unveils a 500,000-Star Portrait of Messier 3
TL;DR Summary
Hubble's new image of Messier 3 shows more than 500,000 stars in a distant globular cluster, highlighting rare RR Lyrae variables and blue stragglers; these features help astronomers measure distances and probe the Milky Way's history, including ancient mergers, as part of a Treasury program surveying galactic clusters.
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