A weird, unidentified X-ray signal radiating out of nearby galaxies has perplexed scientists ever since it was first detected in 2014. Now, a promising study into its origins has come up empty-handed, meaning that whatever is causing the faint signature is currently unknown to us and more mysterious than ever.
Ultimately, the new results leave scientists with two mysteries to solve: the origins of this eerie glow and the true identity of dark matter. Safdi and his colleagues are optimistic that novel techniques and next-generation observatories will be able to constrain both of these tantalizing questions.
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