LIGO/VIRGO/KAGRA collaboration detected a signal indicating a merger between two compact objects, one of which has an unusual intermediate mass, possibly a very low-mass black hole. The draft manuscript on physics arXiv elaborates on the analysis of the merger and the 'mystery object.'
The collaboration has detected dozens of merger events since its initial Nobel Prize-winning discovery. 2021 saw the confirmation of two 'mixed' mergers between black holes and neutron stars, expanding the understanding of celestial phenomena.
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