The merger of two neutron stars produced gravitational waves.
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Compositional: 中子 (zhōngzǐ, neutron — "middle particle") + 星 (xīng, star). Form a Chinese astronomy mini-set this way: 中子星 neutron star, 白矮星 (báiǎixīng) white dwarf, 红巨星 (hóngjùxīng) red giant, 黑洞 (hēidòng) black hole.
