When the universe was only about 900 million years old, a galaxy was forging dense knots of stars. Normally it would be a faint smudge, but the “Cosmic Spear” is the brightest galaxy known from that era, and a massive foreground cluster magnifies its light. Using that cosmic lens with JWST, astronomers resolved individual newborn star clusters inside it — compact, dense and very young, likely the seeds of today’s globular clusters. We explain the finding, and what’s solid versus model-derived.
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 is the brightest galaxy known beyond redshift 6, seen as it was about 900 million years after the Big Bang. Using the gravitational lens of the cluster MACS J0308+2645 and JWST, a team led by Abdurro’uf resolved individual newborn star clusters inside it — compact, dense and very young, likely proto-globular clusters — and found a tentative hint of escaping ionizing radiation relevant to cosmic reionization. Masses and ages are model-derived.){kind=link}