iPTF14hls was supposed to dim in 100 days. Instead it exploded five more times over 1,000 days. Archival photos show it also exploded in 1954. No theory fully explains it.
When astronomers first observed iPTF14hls in September 2014, they identified it as a supernova and expected it to dim within 100 days. Instead, it kept erupting. Over approximately 1,000 days, its br… [+890 chars]
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