A cloud of charged particles stretching over 2 million light-years, shaped like a treble clef, just got its full portrait in today's NASA Astronomy Picture of the Day (https://science.nasa.gov/image-article/apod-2026-october-19-treble-clef-unusual-x-ray-hot-radio-source/), radio emission in red and newly detected Chandra X-rays in blue. The working idea is that a supermassive black hole blew the cloud out long ago, its radio glow faded, and a shock wave from two colliding galaxy clusters switched it back on.
Source: https://science.nasa.gov/image-article/apod-2026-october-19-treble-clef-unusual-x-ray-hot-radio-source/
Image credit: none (no image)
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