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Cosmology

Cosmology

Dark matter’s secret identity: WIMPs or axions?

25 Jun 2024

From the smallest of interactions to the most powerful galactic phenomena, scientists are searching far and wide for the signatures of dark matter. In the second of a three-part series, Keith Cooper discovers that with so little known about this mysterious part of the universe, scientists find their theories of dark matter pitted against each other

galaxy cluster collision MACSJ0025
Clash of the Titans Galaxy-cluster collisions are a natural laboratory in which to uncover the true nature of dark matter. The above image shows galaxy cluster collision MACSJ0025 and was taken with the Hubble Space Telescope and the Chandra X-Ray Observatory. The blue clouds are false colour, representing the location of dark matter as implied by gravitational lensing, while the pink clouds (also false colour) indicate ordinary X-ray-emitting matter detected by Chandra. (Courtesy: NASA, ESA, CXC, M Bradac (University of California, Santa Barbara, USA) and S Allen (Stanford University, USA))
A former South Dakota gold mine is the last place you might think to look to solve one of the univer

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Keith Cooper is a science writer based in the UK
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