Galactic gas can help unveil what dark matter is made of

The search for dark matter – an unknown and invisible substance thought to make up the vast majority of matter in the universe – is at a crossroads. Although it was proposed nearly 70 years ago and has been searched for intensely – with large particle colliders, detectors deep underground, and even instruments in space – it is still nowhere to be found. But astronomers have promised to leave “no stone unturned” and have started to cast their net wider out into the galaxy. The idea is to extract information from astrophysical objects that may have witnessed chunks of it…

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