“Some of these frequencies are extremely high-bandwidth, while some are low-bandwidth, and our goal in the next era of gravitational wave astronomy is to capture multiband observations of both of these frequencies in order to ‘hear the entire song,’ as it were, when it comes to black holes.”

Gravitational waves from pairs of black holes come in many frequencies, which capture different stages of their evolution.

Dr Jani told Express.co.uk: “With the LIGO detector in the US and Virgo in Europe, we are just starting to capture the final act – their catastrophic collision.

“As we show in our study, the proposed NASA/ESA mission LISA can capture low-frequencies of the IMBHs at least four to 10 years in advance before their collision is recorded in LIGO.



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