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Mysterious and inescapable, black holes rank among the most extraordinary entities in the universe. Scientists at HITS, Germany, have predicted that the 'chirp' noise generated when two black holes merge preferentially occurs in two universal frequency ranges. The 2015 detection of gravitational

Knowing that black holes tend to have these masses could help provide a new way of measuring the expansion rate of the universe.

Knowing that black holes tend to have these masses could help provide a new way of measuring the expansion rate of the universe.

Knowing that black holes tend to have these masses could help provide a new way of measuring the expansion rate of the universe.

They are mysterious, exciting and inescapable – black holes are some of the most exotic objects in the Universe. With gravitational-wave detectors, it is possible to detect the chirp sound that two black holes produce when they merge, approximately 70 such chirps have been found so far. A team of researchers at the Heidelberg Institute for Theoretical Studies (HITS) now predicts that in this “ocean of voices” chirps preferentially occur in two universal frequency ranges. The study has been...