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Meet GW190521—a black-hole merger for the record books
By Jennifer Ouellette
Largest black hole collision ever detected
By Rafi Letzter
Gravitational waves: astronomers spot a black hole so massive they weren't sure it could exist
By Ilya Mandel
Scientists detect first mid sized black hole via gravitational waves
By Caitlyn Buongiorno
Astronomers say they've detected the most massive merger of two black holes ever discovered
By Loren Grush
Astronomers spot a super-rare class of black hole for the first time
By Andrew Tarantola
Astronomers spot the biggest, strangest black hole collision ever found
By Michael Greshko
