Einstein's theory of general relativity predicts that colliding black holes and neutron stars generate ‘gravitational waves’ that cause ripples in the fabric of space-time. After such an event, space-time does not return to its original state, instead it stays permanently warped. The astonishing prediction of Monash University researchers (and OzGrav investigators) Eric Thrane and Paul Lasky, along with student Lucy McNeill is that this warping could be detected using the advanced LIGO detector - even when the signal that caused the warping was not observed.
More details in the Press Release, New Scientist article, and the full publication.
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