https://www.news9live.com/science/astronomers-successfully-detect-signal-from-secondary-black-whole-in-binary-pair-oj-287-2179585
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Astronomers successfully detect signal from secondary black whole in binary pair OJ 287 - News9 LIVE
6/15/23 at 8:10am
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News9live.com
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The quasar designated as OJ 287 has been observed since 1888, before astronomers knew other galaxies existed.
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