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Sunday, November 8, 2026 · UTC
Missions & Science

X-ray telescopes confirm the 'Treble Clef' sits in a hidden galaxy cluster

Chandra and eROSITA found hot gas behind the Milky Way's disc at the site of the oddly shaped radio source.

Marcus Adeyemi
Defense & Security Correspondent
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Astronomers uncover hidden galaxy cluster behind Milky Way
Astronomers uncover hidden galaxy cluster behind Milky Way AI illustrationhow this picture was made
CAMBRIDGE, USA, Oct. 14, 2026 - Astronomers used NASA's Chandra X-ray Observatory to analyse what caused a radio-wave formation nicknamed the Treble Clef.[1] Chandra and the German eROSITA telescope detected diffuse, hot gas at its location, confirming that the Treble Clef is hosted by a galaxy cluster.[2] The structure had been hidden from view behind the Milky Way.[3] NASA's Marshall Space Flight Center in Huntsville, Alabama, manages the Chandra program, and the Smithsonian Astrophysical Observatory's Chandra X-ray Center runs its science operations from Cambridge, Massachusetts.[4] Impact Insight. Galaxy clusters are the largest structures held together by gravity, and the hot gas between their galaxies shines in X-rays that can pass through dust that blocks ordinary light. There is no direct planetary-defense link: this is deep-space astronomy, included for readers who follow what space telescopes are finding.
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  1. Astronomers used NASA’s Chandra X-ray Observatory to analyze the cause of the radio wave formation nicknamed the Treble Clef. · science.nasa.govUnited Statesofficial source
  2. NASA's Chandra X-ray Observatory and the German Extended RÖntgen Survey with an Imaging Telescope Array (eROSITA) detected diffuse, hot gas at the location of the Treble Clef, confirming it is hosted by a galaxy cluster. · NASA ScienceUnited Statesofficial source
  3. NASA Chandra and German eROSITA X-ray telescopes were used to observe the structure previously hidden behind the Milky Way galaxy. · Media Indonesia
  4. NASA's Marshall Space Flight Center in Huntsville, Alabama, manages the Chandra program, while the Smithsonian Astrophysical Observatory's Chandra X-ray Center controls science operations from Cambridge, Massachusetts. · NASA ScienceUnited Statesofficial source
The one we could place publishes from United States. 1 could not be placed by their address. 1 is an official body, so this traces to the document itself.