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Galaxies

Galaxy formation, evolution, structure, and observations.

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Authentic scientific composite of the Treble Clef galaxy clusters, blue and purple X-ray gas around bright pink radio emission, on a star-filled black sky

Oct 20, 2026

Chandra Reveals How a Galaxy-Cluster Collision May Have Revived a Strange Radio Structure

Chandra, eROSITA and radio observations suggest the 'Treble Clef' is a radio phoenix: old black-hole plasma apparently reenergized during a galaxy-cluster merger.…

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