Cooling stars hint at dark matter particles

Axions might explain faster-than-expected temperature drop

White dwarf stars

COOL STARS   White dwarf stars (circled) cool as they age. Scientists have found that pulsating stars known as variable white dwarfs cool faster than expected. The discrepancy could be explained by hypothetical particles called axions carrying energy away from the star.

H. Richer/UBC et al., WFPC2HSTNASA

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