A Ghostly Radio Halo Just Changed What We Know About the Early Universe

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Astronomers using the LOFAR radio array have detected a vast “mini-halo” of high-energy particles around galaxy cluster SpARCS1049, whose light has traveled 10 billion years to reach us. The find doubles the previous distance record and shows that colossal clusters have been bathed in charged particles since the universe’s youth. Record-Breaking Mini-Halo Discovery Astronomers have [...]


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