Astronomers reconstruct a cosmic giant forming 11.8 billion years ago

A galaxy cluster, 5,000 times more massive than the Milky Way, was forming when the Universe was just 2.1 billion years old.

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The fact

Combined observations enabled a 3D reconstruction of this structure.

This discovery sheds light on the early stages of galaxy cluster formation.

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Auto-synthesis from 1 media source · identified on September 14, 2026